easy way to calibrate audio frequency generator?...

T

Tinkerer

Guest
I have a Heathkit ET-3100 electronic design experimenter that has a very
basic sine/ square wave function generator. Controls all analog and no
scale really. Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20
Khz on \"high\". Exact frequency depends on where the pot is adjusted.
How can I calibrate this to be more precise, preferably in a simple way?
 
On Sunday, February 28, 2021 at 4:27:15 PM UTC-5, Tinkerer wrote:
I have a Heathkit ET-3100 electronic design experimenter that has a very
basic sine/ square wave function generator. Controls all analog and no
scale really. Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20
Khz on \"high\". Exact frequency depends on where the pot is adjusted.
How can I calibrate this to be more precise, preferably in a simple way?
Click to expand...

Frequency counter. They have cheap Chinese kits on ebay that should give you readings close enough to what that generator would be used for.
 
Tinkerer wrote:
==============
I have a Heathkit ET-3100 electronic design experimenter that has a very
basic sine/ square wave function generator. Controls all analog and no
scale really. Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20
Khz on \"high\". Exact frequency depends on where the pot is adjusted.
How can I calibrate this to be more precise, preferably in a simple way?
Click to expand...

** Time to get a Digital Multimeter with a frequency range.
Not crazy expensive and damn useful.

Plus very accurate.



....... Phil
 
On 28/02/2021 3:27 pm, Tinkerer wrote:
I have a Heathkit ET-3100 electronic design experimenter that has a very basic
sine/ square wave function generator.  Controls all analog and no scale really.
Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20 Khz on \"high\".  Exact
frequency depends on where the pot is adjusted. How can I calibrate this to be
more precise, preferably in a simple way?
Click to expand...

Borrow a freq counter?
 
On 28/02/2021 3:27 pm, Tinkerer wrote:
I have a Heathkit ET-3100 electronic design experimenter that has a very basic
sine/ square wave function generator.  Controls all analog and no scale really.
Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20 Khz on \"high\".  Exact
frequency depends on where the pot is adjusted. How can I calibrate this to be
more precise, preferably in a simple way?
Click to expand...

Borrow a freq counter?
 
On 28/02/2021 21:27, Tinkerer wrote:
I have a Heathkit ET-3100 electronic design experimenter that has a very
basic sine/ square wave function generator.  Controls all analog and no
scale really.  Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20
Khz on \"high\".  Exact frequency depends on where the pot is adjusted.
How can I calibrate this to be more precise, preferably in a simple way?
Click to expand...

One of those cheap digital guitar tuners things might point you in the
right direction ? (everybody knows somebody who plays the guitar)

I believe there are smartphone apps which display the frequency of the
signal coming in to the microphone - whilst recording it. Theres one (of
many) examples at https://audio-frequency-counter.soft112.com

Or if you know anybody with Cubase (or similar) recording software you
could get them to fire up the built in digital tuner tool and see it in
glorious technicolor

AT
 
On 28/02/2021 21:27, Tinkerer wrote:
I have a Heathkit ET-3100 electronic design experimenter that has a very
basic sine/ square wave function generator.  Controls all analog and no
scale really.  Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20
Khz on \"high\".  Exact frequency depends on where the pot is adjusted.
How can I calibrate this to be more precise, preferably in a simple way?
Click to expand...

One of those cheap digital guitar tuners things might point you in the
right direction ? (everybody knows somebody who plays the guitar)

I believe there are smartphone apps which display the frequency of the
signal coming in to the microphone - whilst recording it. Theres one (of
many) examples at https://audio-frequency-counter.soft112.com

Or if you know anybody with Cubase (or similar) recording software you
could get them to fire up the built in digital tuner tool and see it in
glorious technicolor

AT
 
Cheap USB microphone, laptop, Audacity? (Audacity is free recording software with lots of extras, does frequency, etc)
 
Cheap USB microphone, laptop, Audacity? (Audacity is free recording software with lots of extras, does frequency, etc)
 
Tinkerer <tinker5@anytime.net> wrote:

I have a Heathkit ET-3100 electronic design experimenter that has a very
basic sine/ square wave function generator. Controls all analog and no
scale really. Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20
Khz on \"high\". Exact frequency depends on where the pot is adjusted.
How can I calibrate this to be more precise, preferably in a simple way?
Click to expand...

Beat it with mains hum. This should work on the low range and at least
part of the way up the high range.

--
~ Liz Tuddenham ~
(Remove the \".invalid\"s and add \".co.uk\" to reply)
www.poppyrecords.co.uk
 
Tinkerer <tinker5@anytime.net> wrote:

I have a Heathkit ET-3100 electronic design experimenter that has a very
basic sine/ square wave function generator. Controls all analog and no
scale really. Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20
Khz on \"high\". Exact frequency depends on where the pot is adjusted.
How can I calibrate this to be more precise, preferably in a simple way?
Click to expand...

Beat it with mains hum. This should work on the low range and at least
part of the way up the high range.

--
~ Liz Tuddenham ~
(Remove the \".invalid\"s and add \".co.uk\" to reply)
www.poppyrecords.co.uk
 
Liz Tuddenham wrote:

=-===================
Tinkerer <tin...@anytime.net> wrote:

How can I calibrate this to be more precise, preferably in a simple way?

Beat it with mains hum. This should work on the low range and at least
part of the way up the high range.

** You need to explain that idea.
Click to expand...

The OP seems to have no test gear or clue.

....... Phil
 
Liz Tuddenham wrote:

=-===================
Tinkerer <tin...@anytime.net> wrote:

How can I calibrate this to be more precise, preferably in a simple way?

Beat it with mains hum. This should work on the low range and at least
part of the way up the high range.

** You need to explain that idea.
Click to expand...

The OP seems to have no test gear or clue.

....... Phil
 
On 3/1/21 12:04 PM, Tim R wrote:
Cheap USB microphone, laptop, Audacity? (Audacity is free recording software with lots of extras, does frequency, etc)
Click to expand...

Great idea. I have Audacity. I could just play the audio output and
either capture with mic or feed into soundcard and then see what it is
in Audacity. I think that\'s what I\'ll do, although I like Phil\'s
suggestion of a DVM with freq counter, been keeping an eye out for one.
 
On 3/1/21 12:04 PM, Tim R wrote:
Cheap USB microphone, laptop, Audacity? (Audacity is free recording software with lots of extras, does frequency, etc)
Click to expand...

Great idea. I have Audacity. I could just play the audio output and
either capture with mic or feed into soundcard and then see what it is
in Audacity. I think that\'s what I\'ll do, although I like Phil\'s
suggestion of a DVM with freq counter, been keeping an eye out for one.
 
On 3/1/21 2:46 PM, Liz Tuddenham wrote:
Tinkerer <tinker5@anytime.net> wrote:

I have a Heathkit ET-3100 electronic design experimenter that has a very
basic sine/ square wave function generator. Controls all analog and no
scale really. Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20
Khz on \"high\". Exact frequency depends on where the pot is adjusted.
How can I calibrate this to be more precise, preferably in a simple way?

Beat it with mains hum. This should work on the low range and at least
part of the way up the high range.
Click to expand...

Not sure what that means, unless you mean a harmonic of 50/60 Hz. It
might be possible to beat by ear if the PC generates the tone and I
adjust the generator until it matches by ear, but I think I\'m just going
to use Audacity and/or a DWM with freq ctr as suggested by Phil.
 
On 3/1/2021 1:09 PM, Tinkerer wrote:
On 3/1/21 2:46 PM, Liz Tuddenham wrote:
Tinkerer <tinker5@anytime.net> wrote:

I have a Heathkit ET-3100 electronic design experimenter that has a very
basic sine/ square wave function generator.  Controls all analog and no
scale really.  Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20
Khz on \"high\".  Exact frequency depends on where the pot is adjusted.
How can I calibrate this to be more precise, preferably in a simple way?

Beat it with mains hum.  This should work on the low range and at least
part of the way up the high range.


Not sure what that means, unless you mean a harmonic of 50/60 Hz.  It
might be possible to beat by ear if the PC generates the tone and I
adjust the generator until it matches by ear, but I think I\'m just going
to use Audacity and/or a DWM with freq ctr as suggested by Phil.
Click to expand...

Google Online Music Tuner In the US the note A is generally considered
440HZ This one gives the frequency in Hz https://bit.ly/383gzou
 
On 02/03/2021 05:09, Bennett wrote:
On 3/1/2021 1:09 PM, Tinkerer wrote:
On 3/1/21 2:46 PM, Liz Tuddenham wrote:
Tinkerer <tinker5@anytime.net> wrote:

I have a Heathkit ET-3100 electronic design experimenter that has a
very
basic sine/ square wave function generator.  Controls all analog and no
scale really.  Output is from 200 Hz - 2 Khz on \"low\" and 2 Khz to 20
Khz on \"high\".  Exact frequency depends on where the pot is adjusted.
How can I calibrate this to be more precise, preferably in a simple
way?

Beat it with mains hum.  This should work on the low range and at least
part of the way up the high range.


Not sure what that means, unless you mean a harmonic of 50/60 Hz.  It
might be possible to beat by ear if the PC generates the tone and I
adjust the generator until it matches by ear, but I think I\'m just
going to use Audacity and/or a DWM with freq ctr as suggested by Phil.

Google  Online Music Tuner  In the US the note A is generally considered
440HZ  This one gives the frequency in Hz  https://bit.ly/383gzou
Click to expand...


Speaking of which ... I believe some musicians are able to tune their
instruments by using the dial tone from a landline as a reference.

AT
 
Abandoned_Trolley wrote:
======================
Speaking of which ... I believe some musicians are able to tune their
instruments by using the dial tone from a landline as a reference.
Click to expand...

** But only after taking a huge dose of Meth first.


....... Phil
 
On 01/03/2021 18:04, Tim R wrote:
Cheap USB microphone, laptop, Audacity? (Audacity is free recording software with lots of extras, does frequency, etc)
Click to expand...
If you have a PC with a decent sound card you don\'t need an audio
frequency generator :)
 
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