Search found 12 matches

by milton_segretti
Thu Jun 21, 2018 2:58 pm
Forum: AMSynths
Topic: Just built an AM8320
Replies: 7
Views: 2081

Awesome, thank you.

Polyfuses huh, I haven't come across this component before. Every day is a school day though.

I'm off to read up on these polyfuses now.

Thank you again.
by milton_segretti
Tue Jun 19, 2018 4:15 pm
Forum: AMSynths
Topic: Just built an AM8320
Replies: 7
Views: 2081

Hey there truman_k, just finishing up building this and got stuck on P1 and P2. They don't appear on the schematic.

It looks like you used capacitors. What value did you use if you don't mind me asking?
by milton_segretti
Tue Sep 12, 2017 5:20 am
Forum: Music Tech DIY
Topic: [BUILD] SEM VCF
Replies: 510
Views: 51906

The tops do look exceptionally smooth and the edges looked very square which would suggest being sanded.

Live and learn.
by milton_segretti
Tue Sep 12, 2017 4:48 am
Forum: Music Tech DIY
Topic: [BUILD] SEM VCF
Replies: 510
Views: 51906

Thats delightful and a gorgeous looking synth! I had a good think and realised I couldn't be entirely sure of the provenance of the CA3080 chips I had installed. I had previously had LM3080s installed and the module still didn't work but behaved differently. This made me think that if the module is ...
by milton_segretti
Fri Sep 08, 2017 3:33 am
Forum: Music Tech DIY
Topic: [BUILD] SEM VCF
Replies: 510
Views: 51906

It was a concern and I tried both directions.

I think you can see in the image though that the track still goes to the two 15K resistors. If it had been changed I think either it would be going to the other leg or the silkscreen would be facing the other way. Does that make sense?
by milton_segretti
Fri Sep 08, 2017 2:58 am
Forum: Music Tech DIY
Topic: [BUILD] SEM VCF
Replies: 510
Views: 51906

Hello, So here are the images. As I said its all a bit of a mess now. I lost a few pads with swapping out the 2N4302 so many times. I had real bother with them as they were old stock with a blob top format. On one of them the plastic had perished and it wasn't working. I have since got these ones in...
by milton_segretti
Thu Sep 07, 2017 3:56 am
Forum: Music Tech DIY
Topic: [BUILD] SEM VCF
Replies: 510
Views: 51906

I'm not sure. The revision number is under a capacitor. I'll pull it and have a look tonight.

I'll also post some pictures. Be prepared though, it is now very ugly as it has taken a beating from the amount of desoldering, reflowing etc. I have been doing.
by milton_segretti
Thu Sep 07, 2017 3:01 am
Forum: Music Tech DIY
Topic: [BUILD] SEM VCF
Replies: 510
Views: 51906

Hello, Thank you for your reply. One of the things I tried was replacing the pot. I only had a 100K B but that made no difference anyway. I also replaced the wiring to the board at that point too. So I would say that area is quite sound. I'll have another poke around in the area where the wires are ...
by milton_segretti
Wed Sep 06, 2017 2:23 am
Forum: Music Tech DIY
Topic: [BUILD] SEM VCF
Replies: 510
Views: 51906

Hello, Thank you for your reply. Both 120K resistors are installed. I have done the trace cut and reversed the correct transistor. Also just for reference the attenuverter is calibrated and seems to be working with zero in the centre as expected. Regarding the transistors, I have all 6 installed too...
by milton_segretti
Tue Sep 05, 2017 8:37 am
Forum: Music Tech DIY
Topic: [BUILD] SEM VCF
Replies: 510
Views: 51906

Hello, So I have been staring at this thing for some time now and still haven't found a way of essentially broadening the the very narrow sweep area. Here is a picture of what it is like for Low and High Pass filters: https://www.muffwiggler.com/forum/userpix2/37507_screen_shot_20170905_at_140748_1....
by milton_segretti
Fri Aug 18, 2017 7:38 am
Forum: Music Tech DIY
Topic: [BUILD] SEM VCF
Replies: 510
Views: 51906

Hello,

Thanks for the reply.

Both CV pots fitted as per the instructions and double/triple checked the wiring.

:despair:
by milton_segretti
Fri Aug 18, 2017 5:09 am
Forum: Music Tech DIY
Topic: [BUILD] SEM VCF
Replies: 510
Views: 51906

Hello, Having some trouble with this build and was hoping someone might have a few pointers. It looks like I am having a similar issue to Emalot above. Essentially, the module works but the frequency knob only seems to have an effect from fully counter clockwise to about the 10 o'clock position. Wit...

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