Search found 61 matches

by Billb3
Sun Apr 26, 2015 2:00 pm
Forum: PAiA Jabber
Topic: Couple of Fatman questions
Replies: 4
Views: 16199

Re: Couple of Fatman questions

Really nice looking instrument.

sorry I cant help you with your questions.

a thought. flashing eeproms is pretty easy these days, especially with hotflashing old motherboards.

would it be possible to use an eeprom instead of an eprom?

bill
by Billb3
Fri Apr 24, 2015 9:25 am
Forum: PAiA Jabber
Topic: 4771
Replies: 1
Views: 11493

4771

I have just acquired a 4771 regulated p/s. I was suprised that it is'nt capable of producing 18 volts. Is this a problem? (I'm guessing its not) should I add an additional transformer that will produce 18 volts? what is the lowest voltage that will work on the "18 volt" output? I'm thinking of putin...
by Billb3
Thu Apr 16, 2015 3:59 pm
Forum: PAiA Jabber
Topic: Cap replacement - off topic
Replies: 2
Views: 12508

Re: Cap replacement - off topic

I think it would be prudent to replace all the tantalums to prevent future 'tantrums'

since shorted caps tend to blow power supplies I think it makes sense

bill
by Billb3
Tue Apr 14, 2015 5:36 pm
Forum: PAiA Jabber
Topic: Cap replacement - off topic
Replies: 2
Views: 12508

Cap replacement - off topic

I was wondering what is a suitable replacement for tantalum caps on old synths etc. mostly they are 10uf or 1uf. I replaced the 10s with electrolytic and am thinking of using monolithic ceramic caps for the 1's as they are about the same size and lead spacing. these caps are all power supply related...
by Billb3
Tue Mar 24, 2015 4:48 pm
Forum: PAiA Jabber
Topic: Replacing electrolytic capacitors in vintage PAIA products
Replies: 3
Views: 14247

Re: Replacing electrolytic capacitors in vintage PAIA products

More important than replacing electrolytics is replacing tantalum caps. old tantalums short out and will kill power supplies. I am working on a yamaha CS-40m which had a dead P/S and shorted tantalums on several of the boards. got the p/s working but there is other damage among the 12 or so boards t...
by Billb3
Mon Feb 09, 2015 3:47 pm
Forum: PAiA Jabber
Topic: dead Korg DW8000
Replies: 4
Views: 16196

Re: dead Korg DW8000

I have removed the blown chips but now find that the board draws 1.4 amps on the first 5v line (whereas it should draw 700ma).

any suggestions on how to find which other chips are faulty.
by Billb3
Mon Feb 09, 2015 3:45 pm
Forum: PAiA Jabber
Topic: 6750 hyperflange/choorus
Replies: 1
Views: 12108

6750 hyperflange/choorus

I have one of these with no chips in it

the cem3040 is expensive but not as bad as the sad1024.

any suggestions on whether this can be used for anything without spending $200 on chips?

thanks.
by Billb3
Sat Jan 10, 2015 5:40 pm
Forum: PAiA Jabber
Topic: Cable construction for CV's in and out of the 9700?
Replies: 7
Views: 21898

Re: Cable construction for CV's in and out of the 9700?

there needs to be one ground connection between devices. for another external device ie. another synth you should use a grounded connection. if both devices use a 3 prong plug there is a chance they are already ground connected. for connections between modules within the device you dont need it as t...
by Billb3
Sat Jan 10, 2015 1:07 pm
Forum: PAiA Jabber
Topic: fatman 4046 vco
Replies: 0
Views: 13811

fatman 4046 vco

has anyone tried this?

was anyone able to get it to work? or even sort of work?

schematic
http://www.electro-music.com/forum/phpb ... co_856.gif
discussion
http://www.electro-music.com/forum/topic-53852.html
by Billb3
Sat Dec 27, 2014 6:01 pm
Forum: PAiA Jabber
Topic: Fatman panel update
Replies: 2
Views: 18205

Fatman panel update

here is the current state of my Fatman. everything on the panel works (finally). https://www.flickr.com/photos/129435558@N05/15935842520/ I still have osc1 and osc2 syncing up way too much even though I changed to LEDS and 7555s. it actually is worse with the 7555s so I put the original 555s back in...