Search found 61 matches

by Billb3
Thu Apr 24, 2014 9:37 am
Forum: PAiA Jabber
Topic: re: Fatman Anti-phase-lock modification linearity problem
Replies: 3
Views: 16775

re: Fatman Anti-phase-lock modification linearity problem

I have tried several times to get this to work but always end up with the same problem. I can tune the vco for the top and bottom note fine but all the notes in between are wrong. seems like a linearity problem. any thoughts? Billb in case I missed something obvious, the components I changed were 33...
by Billb3
Wed Apr 23, 2014 6:47 pm
Forum: PAiA Jabber
Topic: Current state of my Fatman - patchable
Replies: 0
Views: 15245

Current state of my Fatman - patchable

pretty ugly but it works !

https://www.flickr.com/photos/29708075@N08/13985746331/

still needs noise, s&h, ring, and a few LFOs

Billb
by Billb3
Sat Apr 19, 2014 3:58 pm
Forum: PAiA Jabber
Topic: new Fatman oscillator
Replies: 2
Views: 15662

Re: new Fatman oscillator

here is a link - not sure what happened to the original links

https://www.flickr.com/photos/29708075@ ... otostream/

bill
by Billb3
Sat Apr 12, 2014 10:34 am
Forum: PAiA Jabber
Topic: new Fatman oscillator
Replies: 2
Views: 15662

Re: new Fatman oscillator

here is an updated version of the prototyps

has ramp square with pw, sub -1 and sub -2

also has FM input

shortly will add pwm and triangle

bill
by Billb3
Sat Apr 05, 2014 5:49 pm
Forum: PAiA Jabber
Topic: PAiA 9720 VCO Pulse Width - Goes quiet when fully CCW.
Replies: 16
Views: 50161

Re: PAiA 9720 VCO Pulse Width - Goes quiet when fully CCW.

perhaps the pots are not the same? - A10k vs B10k ? - labeled the same but not ? - well out of tolerance ? - a fixed resistor in series with the pot ? ( I have not looked at a 9720 so I may be off base ) stupid suggestions - pots not mounted the same ? - knobs not installed the same ? btw, you could...
by Billb3
Sat Apr 05, 2014 2:29 pm
Forum: PAiA Jabber
Topic: new Fatman oscillator
Replies: 2
Views: 15662

new Fatman oscillator

I soldered up the oscillator as tiny as I could. It doesn't work consistently and is hard to debug with all the buried components. - the LED goes dim when I connect the cv input. - sometimes it only puts out a high freq wave, about 10khz? my next project is to build a dual osc with ramp, square, sub...
by Billb3
Fri Apr 04, 2014 9:18 am
Forum: PAiA Jabber
Topic: 556 dual 555 timer
Replies: 3
Views: 17286

556 dual 555 timer

I plan to build a dual oscillator and am wondering if using a 556 rather than 2x 555 would be a mistake, ie oscillators locking to easily.

thanks

Bill
by Billb3
Sun Mar 30, 2014 4:12 pm
Forum: PAiA Jabber
Topic: Fatman breadboard projects
Replies: 1
Views: 13594

Fatman breadboard projects

I have breadboarded several add ons for the fatman LFO https://www.flickr.com/photos/29708075@N08/13520916684/ Suboctave and Ramp to Square wave https://www.flickr.com/photos/29708075@N08/13520691423/ Fatman oscillator plus square wave. (I cant get triangle to work properly ) https://www.flickr.com/...
by Billb3
Tue Mar 04, 2014 9:53 pm
Forum: PAiA Jabber
Topic: broken fatman
Replies: 1
Views: 13174

broken fatman

sometimes it works when switched on for a few seconds but usually I just get a "thump" sound when I press a key. audio is making it to pin 3 on the lm13600 vcf. outputs on 8 and 9 seem extremely low.
by Billb3
Fri Feb 28, 2014 11:12 pm
Forum: PAiA Jabber
Topic: Fatman connecting to 4700
Replies: 1
Views: 13415

Fatman connecting to 4700

I modded my fatman to be patchable and found the audio voltage levels are much higher on the fatman. patching fatman to 4700 should be doable with resistors, any thoughts on putting 4700 oscilator output into the fatman?