808 Handclap (almost there)
Woohoo - verified! I had to change C140 to 27n to get separated hits (2n7 in the service manual). This has reverb level on a 16mm edge pot. Requires separate noise source...
View Article808 Bass Drum Clone Eagle PCB & CNC Gcode
I'm deciding whether to try a 12-channel MIDI-CV for this or just build another 8-channel one like the tested/working one above. This 12xDAC looks like it would work, but I still need some kind of...
View Article808 Bass Drum Clone Eagle PCB & CNC Gcode
I guess the only signal that matters for separated voices is what happens at the collector of the PNP. I wish I thought of that before I built every single voice board with the gate circuit. Oh well...
View Article808 Bass Drum Clone Eagle PCB & CNC Gcode
It does seem that keeping the gate at 5V allows the instruments to be triggered with a single scaled accent pulse. I want to make sure the always-open gate is not allowing signal bleed, but I'm...
View ArticleBuchla 194 Stripboard
here's an attempt for that Jurgen's scanner , i have no way to proto - this ,and test things so i just layout the board with two variations for output , one is with TL071 and is ,or can be identical to...
View ArticleHexinverter´s Battery Acid layout
oh dear almost forgot about this. Maybe you already built a new one but what I see on the scope is petty much what I would expect.but since you can't control it you probably get full distortion all the...
View ArticleCopying CR78 Clave Voice
My guess is that if the R was a substitute for a decimal point, the value would be 3.7mH (milli Henry).
View Article4017 Baby Sequencer Stripboard
I'm sorry you are having issues with this. It's a fairly simple circuit and looking again at the diagrams I can see no reason why it wouldn't work. Have you soldered all the pots on and LEDs? What are...
View ArticleCloning the CR78 with MIDI
ouch... this is a though price... but having looked at random sites in the net there are not much better alternatives by price... also 700mH seem to be very rare and obsolete...regarding your other...
View ArticleCloning the CR78 with MIDI
Well, checked the outputs going from the logic boards to the voice board...so far i've found RS, C, BD, LB, LC, SD, CY and HH all voices are active on low... means they stay around 10V or so and the...
View ArticleCloning the CR78 with MIDI
I figured it out from the explanation on the Stereoping page : "One STOPS the guiro when set high (+5 volt). The other halfens the frequency of the multivibrator when set high."It really is a hideous...
View ArticleCloning the CR78 with MIDI
@wackelpeter If you have a chance, could you tell me what the signal looks like at R566? I built the Metale Beat circuit but I get no output with the normal 12V signal pulsing to 0V for 2ms.
View ArticleCloning the CR78 with MIDI
I agree about that 10k spoiling the squares' output. Why do you think they have R581 in the schemo?
View ArticleCloning the CR78 with MIDI
Very nice work! I will try a smaller resistor tonight. Maybe I have to move to 15V as you have said before. I have 2n3904 installed which looks like this:
View ArticleCloning the CR78 with MIDI
What would be a good way to generate that -2v5 from my TTL positive gate? Maybe an opamp with -.5 gain? Any way to do it with a transitor? Also, did you notice the period of the gate? I have tried...
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