Simple circuit to flash an LED from RF...

[amdx]

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

                                Thanks, Mikek

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[server]

On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

                                Thanks, Mikek

I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.

 

[Klaus Kragelund]

31.07.22 22:58, jlarkin@highlandsniptechnology.com wrote:

On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

                                Thanks, Mikek

I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.

Tuned LC with diode to big low leakage cap

Then a BJT multivibrator, can operate in nA
Assign very low duty cycle for LED


--
Klaus

 

[boB]

On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
<klauskvik@hotmail.com> wrote:

31.07.22 22:58, jlarkin@highlandsniptechnology.com wrote:
On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

Thanks, Mikek

I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.


Tuned LC with diode to big low leakage cap

Then a BJT multivibrator, can operate in nA
Assign very low duty cycle for LED

Yes, I was thinking an L-C circuit to boost the voltage at least.

LTspice can be downloaded for free from www.analog.com

I suggest you get it.

boB

 

[amdx]

On 7/31/2022 2:58 PM, jlarkin@highlandsniptechnology.com wrote:

On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

                                Thanks, Mikek
I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.

I was hoping to do it with just a coil and cap. I have some 6\" coils with
Q over 1000. Very high impedance a resonance, so might need a lower
impedance pickup coil.
Their Litz wire, so I don\'t want to tap them.

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[amdx]

On 7/31/2022 7:35 PM, boB wrote:

On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
klauskvik@hotmail.com> wrote:

31.07.22 22:58, jlarkin@highlandsniptechnology.com wrote:
On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

Thanks, Mikek
I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.

Tuned LC with diode to big low leakage cap

Then a BJT multivibrator, can operate in nA
Assign very low duty cycle for LED

Yes, I was thinking an L-C circuit to boost the voltage at least.

LTspice can be downloaded for free from www.analog.com

I suggest you get it.

boB

Ya, I had it for a while played with it had fun with it, I did some
circuits, went out and got subcircuits, all was cool and as I recall I was
trying to show how match was important to power transfer nothing major
just maximum power transfer, I posted it here
got a shit load of flack, was told I need to learn electronics before I
try LT spice. I just said Fuck it. Haven\'t touched it since.
Mikek


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[server]

On Sun, 31 Jul 2022 20:11:54 -0500, amdx <amdx@knology.net> wrote:

On 7/31/2022 7:35 PM, boB wrote:
On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
klauskvik@hotmail.com> wrote:

31.07.22 22:58, jlarkin@highlandsniptechnology.com wrote:
On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

Thanks, Mikek
I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.

Tuned LC with diode to big low leakage cap

Then a BJT multivibrator, can operate in nA
Assign very low duty cycle for LED

Yes, I was thinking an L-C circuit to boost the voltage at least.

LTspice can be downloaded for free from www.analog.com

I suggest you get it.

boB

Ya, I had it for a while played with it had fun with it, I did some
circuits, went out and got subcircuits, all was cool and as I recall I was
trying to show how match was important to power transfer nothing major
just maximum power transfer, I posted it here
got a shit load of flack, was told I need to learn electronics before I
try LT spice. I just said Fuck it. Haven\'t touched it since.
Mikek

LT Spice will teach you electronics! And train your instincts.

My office gets a gigantic RF field from Sutro Tower. I\'ve been meaning
to try to light an LED from that.

A broadband match could scoop up an entire band, not just one station.
When I was a kid, I had a crystal set with a germanium diode and hi-z
magnetic headphones. On some stations, it was deafening. Had to be
many milliwatts.

 

[server]

On Sun, 31 Jul 2022 19:54:46 -0500, amdx <amdx@knology.net> wrote:

On 7/31/2022 2:58 PM, jlarkin@highlandsniptechnology.com wrote:
On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

                                Thanks, Mikek
I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.

I was hoping to do it with just a coil and cap. I have some 6\" coils with
Q over 1000. Very high impedance a resonance, so might need a lower
impedance pickup coil.
Their Litz wire, so I don\'t want to tap them.

You might consider a tuned loop antenna.

What frequency stations do you have nearby?

 

[whit3rd]

On Sunday, July 31, 2022 at 6:12:02 PM UTC-7, amdx wrote:

On 7/31/2022 7:35 PM, boB wrote:
On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
klau...@hotmail.com> wrote:

Tuned LC with diode to big low leakage cap

Then a BJT multivibrator, can operate in nA
Assign very low duty cycle for LED

> > Yes, I was thinking an L-C circuit to boost the voltage at least.

That\'s important because the \'diode\' isn\'t usually as sensitive as a crystal set
(which has terrible breakdown, but good low-bias energy efficiency)
Antennae have impedance, is matters what kind of antenna you connect.

LTspice can be downloaded for free from www.analog.com

I suggest you get it.

Ya, I had it for a while played with it had fun with it, I did some
circuits, went out and got subcircuits, all was cool and as I recall I was
trying to show how match was important to power transfer nothing major
just maximum power transfer, I posted it here
got a shit load of flack...

When you start using an LC tank, the \'maximum power transfer\' trick of impedance
matching becomes irrelevant, because the LC has a flywheel effect (doesn\'t lose energy
just because it didn\'t deliver it to the capacitor). It also has free transformer voltage \'gain\',
but you\'d want to use a tapped loopstick with sliding core to tune; that\'s a nightmare
to characterize in SPICE parameters. You\'d also want to slowly charge
a capacitor to above-LED voltage, then abruptly discharge it, which is a transient
that LTspice can handle, but only with amazing amounts of compute time.

Using LTspice in that effort is excessively hard.

 

[amdx]

On 7/31/2022 10:04 PM, whit3rd wrote:

On Sunday, July 31, 2022 at 6:12:02 PM UTC-7, amdx wrote:
On 7/31/2022 7:35 PM, boB wrote:
On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
klau...@hotmail.com> wrote:
Tuned LC with diode to big low leakage cap

Then a BJT multivibrator, can operate in nA
Assign very low duty cycle for LED

Yes, I was thinking an L-C circuit to boost the voltage at least.
That\'s important because the \'diode\' isn\'t usually as sensitive as a crystal set
(which has terrible breakdown, but good low-bias energy efficiency)
Antennae have impedance, is matters what kind of antenna you connect.

LTspice can be downloaded for free from www.analog.com

I suggest you get it.
Ya, I had it for a while played with it had fun with it, I did some
circuits, went out and got subcircuits, all was cool and as I recall I was
trying to show how match was important to power transfer nothing major
just maximum power transfer, I posted it here
got a shit load of flack...
When you start using an LC tank, the \'maximum power transfer\' trick of impedance
matching becomes irrelevant, because the LC has a flywheel effect (doesn\'t lose energy
just because it didn\'t deliver it to the capacitor). It also has free transformer voltage \'gain\',
but you\'d want to use a tapped loopstick with sliding core to tune; that\'s a nightmare
to characterize in SPICE parameters. You\'d also want to slowly charge
a capacitor to above-LED voltage, then abruptly discharge it, which is a transient
that LTspice can handle, but only with amazing amounts of compute time.

 I disagree with that irrelevant comment, you don\'t want to overload
the tank, you want to keep the voltage up to stay higher on the diode
slope, (so called knee).
Tanks are tapped or coupled to reduce loading on high end crystal sets.
Diodes are picked specifically to go with the Q of your LC. Coupling is
often done by
variable spacing between two tuned LC tank circuits.
For any high end Crystal set, the LC, they are capacitor tuned not
inductor tuned, that\'s fun but not used in high end units. Some crystal
sets, have a separate LC tuned
 to a local station that charges a cap to power an audio amplifier for
the audio when listening to distant stations.
  Sadly the best Crystal radio forum has died after the holder got
Covid, had terrible health problems and the URL fee didn\'t get paid.
Here is the mother load of Crystal radio study, done by Ben Tongue of
Blonder-Tongue fame.

http://kearman.com/bentongue/xtalset/xtalset.html
          Mikek

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[amdx]

On 7/31/2022 9:10 PM, jlarkin@highlandsniptechnology.com wrote:

On Sun, 31 Jul 2022 19:54:46 -0500, amdx <amdx@knology.net> wrote:

On 7/31/2022 2:58 PM, jlarkin@highlandsniptechnology.com wrote:
On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

                                Thanks, Mikek
I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.

I was hoping to do it with just a coil and cap. I have some 6\" coils with
Q over 1000. Very high impedance a resonance, so might need a lower
impedance pickup coil.
Their Litz wire, so I don\'t want to tap them.
You might consider a tuned loop antenna.

What frequency stations do you have nearby?

I have a strong local on 1290, which is right about the Q peak of my 6\"
coils.
I do have a 2 ft, loop antenna that will rotate and do azimuth tilt. I
can put a portable radio in the
middle of that and it makes big signal difference.
 I can also get 870 WWL in New Orleans on a portable From Panama
City Fl.
                                     Mikek


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[John Larkin]

On Sun, 31 Jul 2022 20:04:53 -0700 (PDT), whit3rd <whit3rd@gmail.com>
wrote:

On Sunday, July 31, 2022 at 6:12:02 PM UTC-7, amdx wrote:
On 7/31/2022 7:35 PM, boB wrote:
On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
klau...@hotmail.com> wrote:

Tuned LC with diode to big low leakage cap

Then a BJT multivibrator, can operate in nA
Assign very low duty cycle for LED


Yes, I was thinking an L-C circuit to boost the voltage at least.

That\'s important because the \'diode\' isn\'t usually as sensitive as a crystal set
(which has terrible breakdown, but good low-bias energy efficiency)
Antennae have impedance, is matters what kind of antenna you connect.

A modern schottky diode is better than an old point-contact germanium.
And an LED needs volts, so diode drop isn\'t a big deal.

 

[Ralph Mowery]

In article <tc788p$hbqe$1@dont-email.me>, amdx@knology.net says...

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

                                Thanks, Mikek

How far away from the station and whas there frequency and power ?

 

[Martin Brown]

On 01/08/2022 01:13, Klaus Kragelund wrote:

31.07.22 22:58, jlarkin@highlandsniptechnology.com wrote:
On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station
probably charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

������������������������������� Thanks, Mikek

I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.


Tuned LC with diode to big low leakage cap

Then a BJT multivibrator, can operate in nA
Assign very low duty cycle for LED

I vaguely recall an ancient bipolar transistor low leakage thyristor
functional equivalent that could be used to flash an LED brightly but
very slowly depending on charging of a low leakage reservoir capacitor.

It snapped into conduction when the voltage reached about 4v.

It was briefly in vogue for flashing them in the early red LED era just
prior to UJTs becoming common and cheap.

--
Regards,
Martin Brown

 

[Ricky]

On Sunday, July 31, 2022 at 8:54:55 PM UTC-4, amdx wrote:

On 7/31/2022 2:58 PM, jla...@highlandsniptechnology.com wrote:
On Sun, 31 Jul 2022 10:56:27 -0500, amdx <am...@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

Thanks, Mikek
I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.

I was hoping to do it with just a coil and cap. I have some 6\" coils with
Q over 1000. Very high impedance a resonance, so might need a lower
impedance pickup coil.
Their Litz wire, so I don\'t want to tap them.

A high-Q circuit is going to be useless in this application, because you need to draw power which will spoil the Q of any high-Q circuit. The only use of a high-Q circuit would be for tuning, but with the power you are drawing off, it won\'t be high-Q anymore, just a tuned circuit.


--

Rick C.

- Get 1,000 miles of free Supercharging
- Tesla referral code - https://ts.la/richard11209

 

[Ricky]

On Sunday, July 31, 2022 at 9:12:02 PM UTC-4, amdx wrote:

On 7/31/2022 7:35 PM, boB wrote:
On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
klau...@hotmail.com> wrote:

31.07.22 22:58, jla...@highlandsniptechnology.com wrote:
On Sun, 31 Jul 2022 10:56:27 -0500, amdx <am...@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

Thanks, Mikek
I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.

Tuned LC with diode to big low leakage cap

Then a BJT multivibrator, can operate in nA
Assign very low duty cycle for LED

Yes, I was thinking an L-C circuit to boost the voltage at least.

LTspice can be downloaded for free from www.analog.com

I suggest you get it.

boB

Ya, I had it for a while played with it had fun with it, I did some
circuits, went out and got subcircuits, all was cool and as I recall I was
trying to show how match was important to power transfer nothing major
just maximum power transfer, I posted it here
got a shit load of flack, was told I need to learn electronics before I
try LT spice. I just said Fuck it. Haven\'t touched it since.

LTspice is a PITA. Some of your circuits will likely need custom modules. The documentation for these things is byzantine. You will need to use the LTspice groups for help and you will get multiple, conflicting advice.

LTspice is not for the faint of heart. Also, you do need to understand electronics theory enough to know when your circuit is mucked up and lying to you.

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

 

[legg]

On Sun, 31 Jul 2022 10:56:27 -0500, amdx <amdx@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

                                Thanks, Mikek

So try charging a cap first.

RL

 

[Jan Panteltje]

On a sunny day (Tue, 2 Aug 2022 05:36:37 -0700 (PDT)) it happened Ricky
<gnuarm.deletethisbit@gmail.com> wrote in
<e2885266-349e-4dfa-b728-6c4279190f09n@googlegroups.com>:

A high-Q circuit is going to be useless in this application, because you need
to draw power which will spoil the Q of any high-Q circuit. The only use
of a high-Q circuit would be for tuning, but with the power you are drawing
off, it won\'t be high-Q anymore, just a tuned circuit.

You could use the high Q and a diode to slowly charge a capacitor.

But need more info, field strength, frequency etc.

For 10$ you can get a good RF detector on ebay, I have one.

You could use a mechanical mirco-amp meter and have the hand touch an electrode.
In my case I needed nothing, just a LED connected to my 27 MHz GPA antenna
would flash any time the across the road neighbor turned on his transmitter,
I asked him what power he was using (4 W was legal limit for CB here back then)
but no answer to that question, some used more like 400 W (Italians I have heard).

 

[Jeroen Belleman]

On Sunday, July 31, 2022 at 9:12:02 PM UTC-4, amdx wrote:
On 7/31/2022 7:35 PM, boB wrote:
On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
klau...@hotmail.com> wrote:

31.07.22 22:58, jla...@highlandsniptechnology.com wrote:
On Sun, 31 Jul 2022 10:56:27 -0500, amdx <am...@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

Thanks, Mikek
I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.

Tuned LC with diode to big low leakage cap

Then a BJT multivibrator, can operate in nA
Assign very low duty cycle for LED

Yes, I was thinking an L-C circuit to boost the voltage at least.

LTspice can be downloaded for free from www.analog.com

I suggest you get it.

boB

Ya, I had it for a while played with it had fun with it, I did some
circuits, went out and got subcircuits, all was cool and as I recall I was
trying to show how match was important to power transfer nothing major
just maximum power transfer, I posted it here
got a shit load of flack, was told I need to learn electronics before I
try LT spice. I just said Fuck it. Haven\'t touched it since.

It\'s a bit of a pity that you let the opinions of others deprive you
of a useful tool. Spice has its quirks, but it can help a lot, once
you get the hang of it.

Don\'t try to use it to simulate complete complex circuits.

Jeroen Belleman

 

[server]

On Tue, 02 Aug 2022 15:11:10 +0200, Jeroen Belleman
<jeroen@nospam.please> wrote:

On Sunday, July 31, 2022 at 9:12:02 PM UTC-4, amdx wrote:
On 7/31/2022 7:35 PM, boB wrote:
On Mon, 01 Aug 2022 03:13:19 +0300, Klaus Kragelund
klau...@hotmail.com> wrote:

31.07.22 22:58, jla...@highlandsniptechnology.com wrote:
On Sun, 31 Jul 2022 10:56:27 -0500, amdx <am...@knology.net> wrote:

I\'d like to setup a high Q LC to receive a local Radio station probably
charging a cap, when the charge is high enough flash an LED.
Maybe set the trigger point of an SCR, or could just a zener do it. I
don\'t have LT spice, so please don\'t post and answer with that.

Thanks, Mikek
I expect that a strong radio station could light an LED visibly
continuously, given a good well-matched antenna. Or charge a cap and
use a discharge circuit to get bright blinks.

Here\'s my high-voltage low current blinker:

https://www.dropbox.com/sh/yaqbi52vbpo6uyc/AABPAczwj1zv26-fwI4LvJyha?dl=0

But LT Spice is free, easy to learn, and a wonderful tool for stuff
like this.

Tuned LC with diode to big low leakage cap

Then a BJT multivibrator, can operate in nA
Assign very low duty cycle for LED

Yes, I was thinking an L-C circuit to boost the voltage at least.

LTspice can be downloaded for free from www.analog.com

I suggest you get it.

boB

Ya, I had it for a while played with it had fun with it, I did some
circuits, went out and got subcircuits, all was cool and as I recall I was
trying to show how match was important to power transfer nothing major
just maximum power transfer, I posted it here
got a shit load of flack, was told I need to learn electronics before I
try LT spice. I just said Fuck it. Haven\'t touched it since.

It\'s a bit of a pity that you let the opinions of others deprive you
of a useful tool. Spice has its quirks, but it can help a lot, once
you get the hang of it.

I have got people started on LT Spice, entering and running a basic
circuit, in 5 minutes.

I often use it instead of a calculator, for simple stuff like voltage
dividers and rc circuits. Unlike a calculator, it leaves a record.

Don\'t try to use it to simulate complete complex circuits.

Not entire products, but pretty hairy subsystems.

https://www.dropbox.com/s/dv9qiy2z3x2bxhk/P942_18.jpg?raw=1

As Mike said, the main function of Spice is to train your instincts.