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August 10, 2013 at 1:04 pm in reply to: HELP! Vintage electric mistress makes sound but no effect. #119306StephengilesMember
14.5v on pins 8, 10 is not good so the clock is suspect – it should be around 7-7.5v with the same voltage on pins 3 & 14. I would replace both the LM311 and the 4013 before spending out on the BBD. Good luck – EH should know that!!!
StephengilesMemberThe earliest Microsynth schematic I have is dated 09/1978 if that is any help.
I have a Mk 2 schematic dated 12/12/78
StephengilesMemberStephengilesMemberI tried the first unit sent over to England at EH UK. It tracked very well indeed. All parts are still available with the exception perhaps of the 2 TL601 IC switches, but I’m sure there is a workaround.
StephengilesMemberThat is rubbish, they are trying to fob you off.
StephengilesMemberQuote:Quite different IMO:Vintage 18v EM – The pitch bend can be set more extreme than the deluxe, there is a slight volume drop when engaged, and the lower frequencies are less pronounced than the high frequencies. They use the old Reticon BBD chip. Also, it can run on batteries. Designed by Dave Cockerell.
Deluxe EM – No more volume drop, and the lower frequencies are more present than the vintage unit. The really old model still used the Reticon BBDs, but since the early 80s they switched over to the Panasonics. No battery option. However, they do have a direct output. Designed by Howard Davis.
Stereo EM – Digital circuit, and an entirely different approach using a combination of true stereo chorus and flanger in one unit. Designed by Dave Cockerell.
The clocking and LFO were totally different in the vintage 18v compared with the deluxe. For a start the 18v used LM339 with half a CD4013 for the LFO – not so the deluxe.
May 26, 2010 at 4:00 pm in reply to: New Devices: Germanium^4 Big Muff &, .44 Magnum, Freeze, Neo Clone, & Headphone Amp #105015StephengilesMemberI sat in the room next to Joe Truchess when he was designing the Space Drum at EH UK in 1980 – very strange noises, but a very clever circuit. A VCF using the envelope generator from the Space Drum would be a good product.
StephengilesMemberQuote:Best way to go about it is to audio probe the circuit and trace the signal to where it’s weak and distorted. You can replace the 3080 with a plastic one. It won’t make a difference.
Also check that the batteries are connected properly. Yours should have a 741 IC in it as well. Check that you’re getting +9 on pin 7 and -9 on pin 4.And where pray do you suggest one buys a CA3080?? Perhaps one could do a retrofit for a CA3094 lol!!
February 25, 2010 at 10:27 am in reply to: Weird vintage micro synth. Can anyone tell me about it? #107926StephengilesMemberThe control ciruitry in the original Microsynth was simplified slightly in the Mk II issue.
StephengilesMemberI love the Bite control on the dirt road special.
StephengilesMemberPerhaps 4 optocouplers set up to simulate the two pot sections, so that one resistance decreases as the other increases – not easy, with LED control coming from a pot in the pedal – also problematic as the resistance covered by pedal travel would have to be considered.
August 27, 2009 at 12:20 pm in reply to: New Electro Harmonix V256 Vocoder with Reflex-Tune Video! #100953StephengilesMemberObviously a very cleverly designed unit. As the men were wearing vests, I assume that it was hot there!
StephengilesMemberAgain, I would like to see the Start Frequency follow the strength of the note being played with the sweep left as is – ie apparently ripple free. There are enough trigger signals flying around for this to happen with the addition of a sample & hold.
StephengilesMemberI heard the Spacedrum/Super Spacedrum being designed at EH UK by Joe Truchess – thank clapton for the CA3094!
StephengilesMemberThere is scope for the Spacedrum control voltage to drive the Microsynth sweep filter, think about it EH!!
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