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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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21st Aug 2019, 11:48 am | #1 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Circuit Analysis?
Out of interest, ideas on this one please....
EBF80's D2? AM detector load path? https://nvhrbiblio.nl/schema/Grundig_80U.pdf Lawrence. |
21st Aug 2019, 12:59 pm | #2 |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,061
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Re: Circuit Analysis?
I wondered if it was a clamp diode, in a delayed-AVC system. But I can't see a high-value resistor trying to take the AVC line positive (until overcome by a strong signal's negative rectified carrier). So abandoned this idea.
I think it's just there to give a bit of negative zero-signal bias to the AVC line by contact potential. |
21st Aug 2019, 1:09 pm | #3 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Circuit Analysis?
Replies in bold bold:
Quote:
Lawrence. |
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22nd Aug 2019, 6:46 pm | #4 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,427
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Re: Circuit Analysis?
Is the AM load through the ratio det circuit, it does seem it saves switch contacts?
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Frank |
22nd Aug 2019, 7:05 pm | #5 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Circuit Analysis?
Quote:
The only description of the other diode I can find so far in a similar AGC setup is in the Trader sheet for the KB GR15 where it appears to be a clamp diode to prevent the AGC line going +ve, as to whether that's its correct function is a case of who knows at the moment until I can find some other reference that fits the bill. All theories welcome.. Lawrence. |
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