DrBunsen

Here's another use for a parallel port: drum trigger sequencer

Fixed :P

Then I might as well *ahem* adapt their layout to protoboard, skip the balancing transformers and order the Thats from Smallbear Profusion. That's the "What?" comp. We linked that above. Meanwhile, I had another look at Smallbear's comp ICs. The Q&D Comp 2 from AMZ looks like a really simple build, based on the Analogue Devices SSM2166 - which is slightly cheaper than the That4031 and has an integrated noise gate

Also, I'm happy for people to throw any other DIY comps they find into this thread for future reference.

Add all other board components, and shipping, convert from US pesos dollars to $AU. Multiply by number of drum channels. Then compare I'm not raggin on your suggestion (well maybe a little :-P). I'm also considering a box-otrix or two, or the PAiA tube pres. Also, a THAT based design on perfboard. At the moment I'm running each drum machine (707, SDS) in to a separate stereo compressor patch, pre-mix. I'd *like* to run each voice separately, but maybe that's not realistic. Note though that I'm not talking about final mixdown stereo studio grade niceness - just a bit of tailored chunk and thunk to each drum voice pre-mix, with the option of overdriven nasty. Hence the cheap as possible drive - the cheaper, the more drum voices I can abuse treat this way. Balanced I/O is way overkill Anyone have any thoughts on the Oatley valve pre from way back in the thread?

Sure. But unless I can get this under $30 a channel, it's not worth the bother. I might as well pick up a few Borrowerhingers. I might stretch the budget a bit to go tubular

After discussions in chat (thanks bugfight and stryd_one) it looks like a combination of the DOD 280 and Ken Stone's Stomp Box adapter is a reasonable build

Yah thread necro strikes again: Consider a matrix switching IC

I'll take care of that lot after payday (Thursday) if I can.

Hah! I knew I'd seen that before somewhere: [img width=266 height=200]http://oolite.aegidian.org/screenshots/images2/oolite_003.jpg Elite

Oooo, nice wheel :P

Sehr schoen

I haven't received mine yet from the original order.

Yo, put me down for a gimped board too with me next order.

stryd: you're on buddy. Let's say I wanted the ultra-ultra-cheapest comp possible: a light bulb and an LDR? optocoupler design? /edit/ The DOD 280 optical comp from tonepad fits the bill. And it's pretty darn small. Check out their "full featured compressor" PDF What's the difference, and what's involved in making the change? The word "impedance" springs to mind... Now I'm picturing a 1U case with in/out jacks on the back panel, soldered to an edge connector ... small FX boards plug in to the edge connectors. Another edge connector on the front end of the card connects to unlabelled pots on the front panel, with a scribble strip above them for labelling. I also founf some more compressor ICs at Smallbear

What about Mandarin, where a many-line poem can be composed using only the word shr and different tones?

That's not a bad suggestion. The 4301 is available in DIP. Profusion have them for ~5 UKP in small quantities. And there are two unassigned op-amps on board (hello filter?)

Because when you answer the posting directly above yours, cascading is built in! You read down the page, right?

I'm looking for suggestions for a small, cheap and simple DIY compressor design. I'd like to build 8 into a shallow 1U rack, hence the small, simple and cheap. More if I can fit them. These would be used on individual analogue drum voices, pre-mix. Something dead simple as far as user controls go too - like one knob per channel ;D or none ... Line level synth type signals, not guitar, but range would be an advantage. Running from DC power would be nice. One thought I've had is to mod the Oatley valve pre kit with gain and volume. The board might look big but 2/3 of that is the power supply, which will run 2 pres. It's a little pricier than I was hoping, and they've taken the schematic and PCB artwork down from the site >:( Did I mention it should sound nice?

Wait ... those photos ... you have this stuff sitting on carpet??? Have you not heard of static electricity?

As long as one of them is the datasheet .... ;)

Woah. It's like a disco on your desk