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Old 31st October 2010, 09:58 AM   #1
maouna is offline maouna  Greece
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Default 2 band transistor tone control

hi. i am looking for a 2 band tone control with transistors. i found lots of schematics on the net but i dont know how reliable they are. what do you suggest?

by the way ,which one sounds better ? a tone control with opamps or with transistors?
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Old 19th October 2013, 02:29 PM   #2
maouna is offline maouna  Greece
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3 years later , i decided to build a transistor based tone control. i found a schematic in magazine wireless world from 1974. what do you think?
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Old 19th October 2013, 03:09 PM   #3
eyoung is offline eyoung  United States
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I like it , what transistors were you thinking about using ???

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Old 19th October 2013, 03:52 PM   #4
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better you try this one ...
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Old 19th October 2013, 04:15 PM   #5
maouna is offline maouna  Greece
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im planning to use BC550 or 2N3904
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Old 19th October 2013, 04:17 PM   #6
eyoung is offline eyoung  United States
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Quote:
Originally Posted by dungdochi1978 View Post
better you try this one ...
probably more versatile as opposed to single ended...

E
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Old 19th October 2013, 05:41 PM   #7
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The WW schematic is OK, provided you realise that noise levels will be high, relative to modern designs, as there is no indication or provision of regulation, filtering of the power rail or suggestions for what to do about RFI or EMI if they become a problem in your board layout and wiring.

You will be on your own unless it is detailed in an article there, possibly relying on lots of bypassing, filtering and careful grounding. Personally, I would shield this or keep it separate in a freestanding preamp. The adjustment of R18,21 seems quite a strange feature. Is the setting explained in the text?
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Old 19th October 2013, 07:09 PM   #8
eyoung is offline eyoung  United States
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which WW article are we looking at for reference...

Regards,El
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Old 19th October 2013, 07:30 PM   #9
maouna is offline maouna  Greece
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about line regulation i am planning to use a shunt regulator.About RFI or EMI , would a 47pf cap across base -collector of first emmiter follower transistor be helpful?

this is the article . http://www.keith-snook.info/wireless...ited%20DCD.pdf

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Old 19th October 2013, 07:45 PM   #10
Mooly is offline Mooly  United Kingdom
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I remember a very similar circuit in Practical Wireless, probably around 1976 ? It looked very similar from memory but just had the two conventional pots.

Anyhow... I couldn't resist seeing how this worked in simulation. Its very much of its time, probably sounds "nice" but ultimately lacks the precision that opamps bring to the response. The response here is with the pots centred, looks awful, but look at the scale. Perhaps not so bad in context.
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