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Old June 15th 04, 06:33 AM
Alan Peake
 
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The 2Q4 was an 8-pin plug-in (octal?) and this is how it is shown in
the 51SB-B sideband generator schematic.

Pin 1 - 680pF - 487k - Pin 2 - 770k||430pF - Pin 3

Pin 5 - 680pF - 125k - Pin 6 - 198k||430pF - Pin 7

Pins 1 & 5 were strapped and fed with one side of a balanced, band-
limited audio input and 3 & 7 (also strapped) with the other. Phase-
shifted outputs were then taken from 2 & 6. I guess that 4 or 8 could
have been a grounded shell.

I haven't worked it out but wouldn't be surprised if these are not
just Wein Bridge values for a certain frequency.


Cheers - Joe


Many thanks Joe - I'll put those values into my
simulator and see what comes out.
Cheers,
Alan

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Old June 15th 04, 08:13 PM
Steve Nosko
 
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"Alan Peake" wrote in message
...


The 2Q4 was an 8-pin plug-in (octal?) and this is how it is shown in
the 51SB-B sideband generator schematic.

Pin 1 - 680pF - 487k - Pin 2 - 770k||430pF - Pin 3

Pin 5 - 680pF - 125k - Pin 6 - 198k||430pF - Pin 7

Pins 1 & 5 were strapped and fed with one side of a balanced, band-
limited audio input and 3 & 7 (also strapped) with the other. Phase-
shifted outputs were then taken from 2 & 6. I guess that 4 or 8 could
have been a grounded shell.

I haven't worked it out but wouldn't be surprised if these are not
just Wein Bridge values for a certain frequency.


Cheers - Joe


Many thanks Joe - I'll put those values into my
simulator and see what comes out.
Cheers,
Alan


Alan,
Remembering back... there were two common designs. The difference
depended upon the rest of the circuit. I believe it had to do with the load
impedance presented to the network by the rest of the circuit.

--
Steve N, K,9;d, c. i My email has no u's.


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Old June 15th 04, 08:13 PM
Steve Nosko
 
Posts: n/a
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"Alan Peake" wrote in message
...


The 2Q4 was an 8-pin plug-in (octal?) and this is how it is shown in
the 51SB-B sideband generator schematic.

Pin 1 - 680pF - 487k - Pin 2 - 770k||430pF - Pin 3

Pin 5 - 680pF - 125k - Pin 6 - 198k||430pF - Pin 7

Pins 1 & 5 were strapped and fed with one side of a balanced, band-
limited audio input and 3 & 7 (also strapped) with the other. Phase-
shifted outputs were then taken from 2 & 6. I guess that 4 or 8 could
have been a grounded shell.

I haven't worked it out but wouldn't be surprised if these are not
just Wein Bridge values for a certain frequency.


Cheers - Joe


Many thanks Joe - I'll put those values into my
simulator and see what comes out.
Cheers,
Alan


Alan,
Remembering back... there were two common designs. The difference
depended upon the rest of the circuit. I believe it had to do with the load
impedance presented to the network by the rest of the circuit.

--
Steve N, K,9;d, c. i My email has no u's.


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