I haven’t tried these out but his build guide is a super detailed with awesome wiring diagrams. Leaves nothing to the imagination. The build is on protoboard for all modules, which is awesome as I just picked up a few to tinker with from Microcenter.
Looks like Tayda has stock on the 2SC945 but I cant find the 2SA733 or figure out what would be the suitable replacement [I only searched for 10mins…tho]
the 2SA733 is $6.95 over on Ebay , it is rare and and this is just for one, but usa buyer, not China and there are spec sheets on equivalents. Thanks for the share great circuits to build yes us thanks again .
@binarymob
All the Eric Archer 808 modules have been adapted to stripboard if that is easier for you. I’ve built the kick, voice,cowbell, cymbal, hi-hats, and started the snare, though my high-hats aren’t working yet.
@EddyBergman I saw you were asking about the 808 accents in synth DIY. I thought it would be helpful to some in this group that are also interested in building these to repost some of this info.
Accent, technically, never made it all the way to the voice itself.
Here’s a thumbnail of how the 808 dealt with clocks and voicing…
There is a trigger pulse that is constant – it goes to all the voices, all the time.
There is a voice enable gate of 5 V, and the voice can’t fire without the gate being enabled. This is how they control which voices fire on a given step/trigger pulse.
The trigger pulse is conditioned after it comes out of the MCU. It is combined with the accent LEVEL, so that the trigger pulse itself is between 4V (the nominal value) and 14V (maximum accent). This is why the accent is a global parameter – all the voices that fire on an accented step get that accent.
When people started making individual drum voices, they saw that the voice input had two parts (the gate and the trigger as I’ve described) but they either didn’t look more deeply at the circuit, or they didn’t want to add the additional circuitry to make the voice fully emulate the original, so they basically called one input the trigger and the other the accent and left it at that. Depending on how you assign those, they do kind of work that way – you can set the “normal” trigger input to be an accent level and use the “gate” input as the trigger, and it will function more or less the way you expect it to.
The service manual for the 808 is out there, it’s got some good information in it, that and playing with these circuits is how I learned this.
Archer’s schematics use BC546/556 everywhere (7/8/9 will work too), except for the noise source (where you can probably use one too, but noise transistors are a bit “try the ones you have until you find one with nice noise, throw away the others”).
(If you think he doesn’t, you’re looking at the wrong pages in these PDFs )
Glad i found this info here and maybe someone can point me in the right direction.
So, i build the 808 snare that minus from electro-music kindly shared and it only triggers the snare when i have a gate (5v) fired into the trigger and (5v)the accent. Before i tie this thing to +12v like i have read , couldnt i just tie the accent to the trigger in?
