What type of diode should i use in this circuit? - diyAudio
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Old 14th March 2012, 04:58 AM   #1
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Default What type of diode should i use in this circuit?

Hi all,
I have built this circuit. It is the driver for a spring rev. transducer. In my reading 'being a novice' i have discovered that a there are specific diodes for the signal path. currently D1 and 2 are 1n4001's should i use something different?

Anyway; heres the schematic.

Cheers!
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Old 14th March 2012, 05:31 AM   #2
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1N4148's seem to be commonly used in that type of circuit. It may not make much of a difference,4001's should be okay.
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Old 14th March 2012, 06:00 AM   #3
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Hi DigitalJunkie,

Thank-you for your reply, I have a few 1n4148's at my disposal i also have some OA91 germanium type NOS I should try them as well.

Cheers
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Old 14th March 2012, 06:11 AM   #4
blu_glo is offline blu_glo  England
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oa91s are germanium types they would probably work but bear in mind the forward voltage is only approx 0.2V . this means in your circuit, as it stands, reduced output transistors' bias current.
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Old 14th March 2012, 06:34 AM   #5
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ok thanks for that blu_glo, I had better stick to the 1n4148"s then.

Cheers
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Old 14th March 2012, 06:44 AM   #6
blu_glo is offline blu_glo  England
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in fact (too early in the morning here) your output transistors would be biassed practically off this would be running class b with significant crossover distortion. maybe not such a good idea?
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Old 14th March 2012, 06:45 AM   #7
blu_glo is offline blu_glo  England
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I'm not saying you can't use them - just you'd need 6 or so in the same place as the two silicon ones you're replacing
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Old 14th March 2012, 06:50 AM   #8
blu_glo is offline blu_glo  England
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I got one of those reverb lines somewhere - are they any good for hi-fi use?
I was going to rig it up with a SE 2W valve driver and pick up the other end with a valve signal amplifier. What sort of signal in/out do these things need typically? I have absolutely no data and plenty potential to fuse the windings!
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Old 14th March 2012, 07:20 AM   #9
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Quote:
Originally Posted by blu_glo View Post
I'm not saying you can't use them - just you'd need 6 or so in the same place as the two silicon ones you're replacing
I would like to use a single component where possible in my mind if i can keep it as simple as possible the is less room for mistakes.

With regards to the reverb all the information I know is from the following websites: ::::::::: Accu Bell Sound Inc ::::::::: Spring Reverb

the first site has the translation for the code that should be printed on the unit somewhere.

Cheers
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Old 14th March 2012, 07:25 AM   #10
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oh yeah, and as far as valves are concerned check this guy out, The Valve Wizard

typically most valve drivers use a transformer to match the impedance for the reverb input but I quite like the 12au7 srpp mentioned at the end of the page, super simple!

cheers
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