Horrifying Transmitter PA

[Clifford Heath]

This made my eyes bleed (referenced from Twitter):

<https://www.pi4raz.nl/razzies/razzies201806.pdf>

Clifford Heath.

 

[Clifford Heath]

On 14/5/19 8:59 am, bitrex wrote:

On 5/13/19 6:57 PM, Phil Hobbs wrote:
On 5/13/19 6:01 PM, Clifford Heath wrote:
This made my eyes bleed (referenced from Twitter):

https://www.pi4raz.nl/razzies/razzies201806.pdf
Yikes.  A complete bastard mixture of righteous dead-bug and effete
Manhattan construction.
Phil Hobbs

I thought he was talking about using 7805 voltage regulators as the
output stage.

I was. I wonder what the Ft of a 78L05 is?

 

[bitrex]

On 5/13/19 6:57 PM, Phil Hobbs wrote:

On 5/13/19 6:01 PM, Clifford Heath wrote:
This made my eyes bleed (referenced from Twitter):

https://www.pi4raz.nl/razzies/razzies201806.pdf

Clifford Heath.

Yikes.  A complete bastard mixture of righteous dead-bug and effete
Manhattan construction.

Cheers

Phil Hobbs

I thought he was talking about using 7805 voltage regulators as the
output stage. You can (ab)use those lots of ways...

 

[Phil Hobbs]

On 5/13/19 6:01 PM, Clifford Heath wrote:

This made my eyes bleed (referenced from Twitter):

https://www.pi4raz.nl/razzies/razzies201806.pdf

Clifford Heath.

Yikes. A complete bastard mixture of righteous dead-bug and effete
Manhattan construction.

Cheers

Phil Hobbs

 

[Cursitor Doom]

On Tue, 14 May 2019 08:01:27 +1000, Clifford Heath wrote:

This made my eyes bleed (referenced from Twitter):

https://www.pi4raz.nl/razzies/razzies201806.pdf

I can only dream about achieving that standard of build quality.




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[bitrex]

On 5/13/19 7:22 PM, Clifford Heath wrote:

On 14/5/19 8:59 am, bitrex wrote:
On 5/13/19 6:57 PM, Phil Hobbs wrote:
On 5/13/19 6:01 PM, Clifford Heath wrote:
This made my eyes bleed (referenced from Twitter):

https://www.pi4raz.nl/razzies/razzies201806.pdf
Yikes.  A complete bastard mixture of righteous dead-bug and effete
Manhattan construction.
Phil Hobbs

I thought he was talking about using 7805 voltage regulators as the
output stage.

I was. I wonder what the Ft of a 78L05 is?

Probably not that shabby when it's being used as a power buffer, with
the signal coming in the "ref" pin, as it is here. The expectation is
that the feedback loop is going to be rejecting voltage ripple on the
Vin terminal so the voltage gain is higher and bandwidth lower from that
way.

It's only a two-stage amp internally, diff pair feeding an emitter
follower, and I think feeding it via the ref pin drops the Miller comp
cap out of the picture as both diff pair inputs are moving in unison.

 

[bitrex]

On 5/13/19 7:33 PM, bitrex wrote:

On 5/13/19 7:22 PM, Clifford Heath wrote:
On 14/5/19 8:59 am, bitrex wrote:
On 5/13/19 6:57 PM, Phil Hobbs wrote:
On 5/13/19 6:01 PM, Clifford Heath wrote:
This made my eyes bleed (referenced from Twitter):

https://www.pi4raz.nl/razzies/razzies201806.pdf
Yikes.  A complete bastard mixture of righteous dead-bug and effete
Manhattan construction.
Phil Hobbs

I thought he was talking about using 7805 voltage regulators as the
output stage.

I was. I wonder what the Ft of a 78L05 is?

Probably not that shabby when it's being used as a power buffer, with
the signal coming in the "ref" pin, as it is here. The expectation is
that the feedback loop is going to be rejecting voltage ripple on the
Vin terminal so the voltage gain is higher and bandwidth lower from that
way.

It's only a two-stage amp internally, diff pair feeding an emitter
follower, and I think feeding it via the ref pin drops the Miller comp
cap out of the picture as both diff pair inputs are moving in unison.

Driven that way I think the whole IC functions more or less as the
equivalent of a common base amp feeding common emitter power buffer, but
one you don't have to think about biasing n shit.

 

[bitrex]

On 5/13/19 7:46 PM, bitrex wrote:

On 5/13/19 7:33 PM, bitrex wrote:
On 5/13/19 7:22 PM, Clifford Heath wrote:
On 14/5/19 8:59 am, bitrex wrote:
On 5/13/19 6:57 PM, Phil Hobbs wrote:
On 5/13/19 6:01 PM, Clifford Heath wrote:
This made my eyes bleed (referenced from Twitter):

https://www.pi4raz.nl/razzies/razzies201806.pdf
Yikes.  A complete bastard mixture of righteous dead-bug and effete
Manhattan construction.
Phil Hobbs

I thought he was talking about using 7805 voltage regulators as the
output stage.

I was. I wonder what the Ft of a 78L05 is?

Probably not that shabby when it's being used as a power buffer, with
the signal coming in the "ref" pin, as it is here. The expectation is
that the feedback loop is going to be rejecting voltage ripple on the
Vin terminal so the voltage gain is higher and bandwidth lower from
that way.

It's only a two-stage amp internally, diff pair feeding an emitter
follower, and I think feeding it via the ref pin drops the Miller comp
cap out of the picture as both diff pair inputs are moving in unison.

Driven that way I think the whole IC functions more or less as the
equivalent of a common base amp feeding common emitter power buffer

Common collector/emitter follower, rather

 

[George Herold]

On Monday, May 13, 2019 at 6:01:34 PM UTC-4, Clifford Heath wrote:

This made my eyes bleed (referenced from Twitter):

https://www.pi4raz.nl/razzies/razzies201806.pdf

Clifford Heath.

I dare not share my monstrosities.

GH

 

[Jan Panteltje]

On a sunny day (Tue, 14 May 2019 08:01:27 +1000) it happened Clifford Heath
<no.spam@please.net> wrote in <_OlCE.56231$GV5.43340@fx46.iad>:

This made my eyes bleed (referenced from Twitter):

https://www.pi4raz.nl/razzies/razzies201806.pdf

Clifford Heath.

Interesting,
making things from parts that you have.
Did not expect the 7805 series to go to MHz ..

Something for when you are stuck in 'merrica and need to send an SOS and only have some old power supplies.
https://thegrayzone.com/2019/01/29/the-making-of-juan-guaido-how-the-us-regime-change-laboratory-created-venezuelas-coup-leader/

 

[Cydrome Leader]

Clifford Heath <no.spam@please.net> wrote:

This made my eyes bleed (referenced from Twitter):

https://www.pi4raz.nl/razzies/razzies201806.pdf

Clifford Heath.

looks metric to me.