DIY analog delay

GrantB · 6th November 2002, 08:40 AM

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.

crown300 · 13th November 2002, 11:22 AM

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.

crown300 · 13th November 2002, 11:43 AM

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.

JBL · 13th November 2002, 01:23 PM

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.

GrantB · 15th November 2002, 02:40 AM

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.

6th November 2002, 08:40 AM	#1
GrantB diyAudio Member Join Date: Mar 2002 Location: Seattle	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.

13th November 2002, 01:23 PM	#4
JBL diyAudio Member Join Date: Aug 2001 Location: Canada, N.-B.	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. __________________ Jonathan Blanchard (J.Bl.) ---Nothing is impossible---

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13th November 2002, 11:22 AM	#2
crown300 diyAudio Member Join Date: Oct 2002 Location: pittsboro, NC	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.

13th November 2002, 11:43 AM	#3
crown300 diyAudio Member Join Date: Oct 2002 Location: pittsboro, NC	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.

15th November 2002, 02:40 AM	#5
GrantB diyAudio Member Join Date: Mar 2002 Location: Seattle	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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