Search found 58 matches

by patrickvf
Wed Jan 08, 2020 9:26 am
Forum: PAiA Jabber
Topic: 4780 sequencer behaving strange when installed
Replies: 1
Views: 3950

4780 sequencer behaving strange when installed

I got this paia 4700 system sans sequencer some time ago, and I have a 4780 sequencer kicking around in a drawer with some other modules. To keep it short, when I install it in the cabinet, the 1st and last step don't play and the pitch low. I established that nothing shorts between any modules and ...
by patrickvf
Sat Jul 06, 2019 8:50 pm
Forum: PAiA Jabber
Topic: Question about the midi2cv8 hz/v option
Replies: 1
Views: 8388

Question about the midi2cv8 hz/v option

Does this convert the entire module to hz/v or does it allow to set the outputs to v/oct or hz/v individually? If not, is it possible to add a switch to switch the hz/v option in and out as needed? The reason I ask is that I recently acquired a 9700 modular, and now expecting a 4700 soon. I would li...
by patrickvf
Sun Feb 16, 2014 7:06 pm
Forum: PAiA Jabber
Topic: Paia 2720 BPF improvements?
Replies: 9
Views: 25619

Re: Paia 2720 BPF improvements?

Getting back at this topic - I have a few more questions about the BPF and LPF: About the BPF - ModularMe pointed at an Electro-Music post that suggests that replacing capacitors C3, C4 and C5 with lower values would increase the Q of the BPF. I'm curious what would happen if I used unequal values, ...
by patrickvf
Fri Feb 14, 2014 9:49 pm
Forum: PAiA Jabber
Topic: A cpl questions about 27xx LFO
Replies: 4
Views: 17561

Re: A cpl questions about 27xx LFO

Ok, this is not the same circuit I was talking about but this one is even simpler and uses one dual op-amp, 10 parts total if you count in the biasing circuit. I haven't tried this though, so don't ask me about it's performance. http://www.experimentalistsanonymous.com/diy/Schematics/Oscillators%20L...
by patrickvf
Fri Feb 14, 2014 9:36 pm
Forum: PAiA Jabber
Topic: A cpl questions about 27xx LFO
Replies: 4
Views: 17561

Re: A cpl questions about 27xx LFO

There is a simple LFO schematic flying around the web somewhere. If I remember correctly, it puts out a triangle and a squarewave, and it utilizes a quad op-amp and just a handful of rc components. I'll have to look around and find it again. It's very simple and low parts count. I'll post a link to ...
by patrickvf
Fri Feb 14, 2014 1:12 pm
Forum: PAiA Jabber
Topic: 4780 no trigger signal when synced to external clocl
Replies: 4
Views: 16775

Re: 4780 no trigger signal when synced to external clocl

Sorry for the late reply - to get the sequencer to retriggeer itself, you need to stick one end of a patch cable in the jack where you want the sequence to end and the other end in the jack where you want the sequence to begin. You can do some neat odd sequences by bridging steps withing that sequen...
by patrickvf
Fri Feb 14, 2014 12:37 pm
Forum: PAiA Jabber
Topic: A cpl questions about 27xx LFO
Replies: 4
Views: 17561

A cpl questions about 27xx LFO

1. What kind of waveform does this LFO use? Sine or triangle? And if it's a triangle LFO, would I be able to say route the symmetry trimmer to the front and use that to change the triangle to rising/falling ramp? 2. Which components affect the depth and rate of the LFO and what would you suggest to ...
by patrickvf
Wed Jan 29, 2014 8:30 pm
Forum: PAiA Jabber
Topic: 2720 noisy VCA problem
Replies: 2
Views: 13371

2720 noisy VCA problem

I finally got around replacing some modules in my working 2720 with those from the other one (the modules with the brown jacks). While the hum is mostly gone, and the signal is nice and strong (through the BPF at least), the VCA has some serious issues. There is a lot of noise and when patched to on...
by patrickvf
Wed Jan 08, 2014 10:10 pm
Forum: PAiA Jabber
Topic: q for patrick
Replies: 1
Views: 11475

Re: q for patrick

Unfortunately I did not document any of the mods, but then again most of them didn't work properly or not at all (to my observation) and most of the mods basically connected some modules internally with each other over a terminal strip (e. g. the VCO had a switch that routed it to the LFO, others af...
by patrickvf
Wed Jan 08, 2014 9:45 pm
Forum: PAiA Jabber
Topic: 2720 Power supply - replaced capacitors, still hums.
Replies: 10
Views: 29692

Re: 2720 Power supply - replaced capacitors, still hums.

Nope, didn't get around to do that yet, and I don't think that I'll have the time to do such extensive work in the near future, but that doesn't mean that I'll never get to it. But instead I decided to switch the power supply with the one from the Paia that I gutted (was crappily put together, to sa...