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Old 6th November 2002, 08:40 AM   #1
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Default DIY analog delay

Anyone built an analog delay from scratch before with "bucket brigade" chips? I would like a stereo one, so I'm thinking of building my own.
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Old 13th November 2002, 11:22 AM   #2
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Several years ago I built one that used a dual 1024 bit chip that would also do flanging(sp), I was using simular hardware at work (unscrambling Divers helum speach - they sound like Donald Duck). The board layout was in some magazine and we did a quick pcb and built it.
The main problem was it was VERY noisy and needed much better output filtering than was in the original circuit. I also seem to recall that the clock section was critical.
If I was doing one today I would look into a DSP chip due to its flexibility.
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Old 13th November 2002, 11:43 AM   #3
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2nd part:
A web site that has a "phase shifter" is paia:
http://www.paia.com/epfm.htm
go about 1/2 way down and look for CA-21. If you used that circuit and modified the clock to a fixed frequency you would get a "delay" effect.
The book might be a good starting point also. I think by the time you control the noise you are into lo-fi sound.
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Old 13th November 2002, 01:23 PM   #4
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In Randy Slone book "audiophile project sourcebook" they is two circuit that use Bucket Brigade.

One is a short delay unit and the other one is a chorus.
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Old 15th November 2002, 02:40 AM   #5
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Thanks for the tips!

The sound of a BBD can be supprisingly good for a short delay, and the distortion characteristics of this approach are considered desirable as a musical effect, which is what I'm going for. Check out the audio samples of the Modcan Super Delay 30A synthesizer module: http://www.modcan.com/MODHTML/delay.html

It uses two Matsushita MN3005 chips with compander NR and two 6 pole butterworth filters.
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