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Old 19th October 2013, 07:00 PM   #11
maouna is offline maouna  Greece
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this is a layout i made...correct part values are not specified yet on the silkscreen
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Old 19th October 2013, 07:05 PM   #12
Mooly is offline Mooly  United Kingdom
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Nice board I see you have reworked a lot of the values.
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Old 19th October 2013, 07:31 PM   #13
maouna is offline maouna  Greece
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no i havent reworked anything yet. the only thing i did was to add 0.47u bypass capacitors to all electrolytic caps that pass signal,added base collector capacitor to first transistors,added rail bypass capacitors and 100ohm resistor at output. the writer used 25V supply rail and a boost cut of +-18db. i will have to recalculate values for +-10db boost/cut and maybe i use 30V for supply rail.
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Old 20th October 2013, 06:35 AM   #14
Mooly is offline Mooly  United Kingdom
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I was going off the PCB... totally different to the circuit in post #2 and in the pdf
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Old 20th October 2013, 11:25 AM   #15
gannaji is offline gannaji  India
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Quote:
Originally Posted by eyoung View Post
which WW article are we looking at for reference...

Regards,El
The original article is by M V Thomas and is available on line at http://www.keith-snook.info/wireless...ited%20DCD.pdf

--gannaji
Sorry, my mistake, the ref to original article is already given!
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Old 20th October 2013, 05:52 PM   #16
Mooly is offline Mooly  United Kingdom
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The way the circuit is drawn isn't very intuitive. The left side of the 25uf cap (the output) is actually fully AC coupled, ground referenced and has zero volts DC present.
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Old 20th October 2013, 06:02 PM   #17
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OOps, sorry - I had deleted my post before I saw your reply, Mooly. Yes, I realized it was AC coupled and made it rather pointless. Still not sure about low output impedance, though.
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Old 20th October 2013, 06:57 PM   #18
Mooly is offline Mooly  United Kingdom
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Its pretty average all round technically. Output swing is around -/+5 volts but that remains a constant down to a couple of k loading. I bet it sounds OK though.
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Old 20th October 2013, 07:26 PM   #19
maouna is offline maouna  Greece
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i etched the pcb board...
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Old 25th October 2013, 09:48 AM   #20
maouna is offline maouna  Greece
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Mooly , i also made 2 pcb layouts for 2 band tone control using opamps this time. both pcbs include input filter,but the main difference is that the one pcb includes fets for class A biasing of opamps and the other one not. which version do you think is better to etch?
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