The old caps are fine. They're just old.

Thanks for the replies, guys. I will just repair the existing supply. I might replace the good diode bridge too, just in case it is also deteriorating.

For something that old, what is involved (most likely) is changing the number of turns of wire on a mains-frequency transformer. You could double the number of secondary turns if there is room for all that wire, or you could halve the number of primary turns. In either case, the current through the ...

Hi everyone, I am working on repairing my Dad's Roland JX-3P. I have determined that the two fuses for the +15V and -15V rails are blown, and two opposite diodes in the bridge rectifier have failed short. I cannot find any other damage that could have precipitated this. The best theory I can come up...

Anyone recognise the synth in the attached image? It looks like a MIDI version of the right-hand part of a Russian accordion.

I found a great web site here: http://www.allaboutcircuits.com It looks like someone wrote a textbook and couldn't get a publisher, so they uploaded it :) This is all more complicated than I thought. If circuit design were just a bunch of equasions, I'd be off to the races, but there's more too it t...

I would like to learn circuit design so I can repair and modify analog synthesizers, or maybe even design one from scratch. I would love it if someone could recommend a good textbook, website or other resources for me to learn about this. So far, I am 2 weeks from finishing high school with a good k...

Anyone every tried selling sample collections?

I'm thinking of buying an analog modular synth. Is it reasonable to expect it to pay for itself in sample collection sales in my lifetime? (Let's assume I'm a pretty good synth programmer, just to simplify things)

Has anyone used both? Please focus comparison on sound, of all types - pads, keys, leads, basses, techno, FX and acoustic imitations. If I got a modular, I would make extensive use of making SoundFonts of my creations so I could play them polyphonically. I would write a program to make SoundFonts au...

In the "liquid" department, I'd go for the JX-3P on account of its having 2 oscs per voice. It lends itself better to fluid pads and keys than a single-oscillator synth. The JX-3P and JUNO-60 have the same filter unit FYI (Roland IR3109). Although, one thing to consider is that the JUNO has a 6-voic...

first, in FM as used by Yamaha (which is really phase modulation ) it actually isn't using oscillators- scanned wavetables if i remember. second, Yamaha is describing these "oscillators" as used in the context of a greater mathematical function therefore operator is a correct mathematical label. Th...

What's the difference between an "oscillator" in subtractive synthesis and an "operator" in FM?