Search found 101 matches

by deepblackjoe@gmail.com
Sat Jan 11, 2020 3:55 pm
Forum: Music Tech DIY
Topic: Dusg led query
Replies: 4
Views: 485

Dusg led query

So I'm wondering if someone could please help me understand this better. I've built up a dusg with LEDs from tayda, which they say are 20ma, yellow. The current limiting resistors are 1k, and 47k at the base of the transistors, which is the silkscreen value, but the schematic has 150k. When I power ...
by deepblackjoe@gmail.com
Mon Dec 30, 2019 12:37 pm
Forum: Music Tech DIY
Topic: Stroh operator wiring diagram
Replies: 2
Views: 381

Stroh operator wiring diagram

I looked thru the different threads about this,and can't find one anywhere. Not sure which way the pots are supposed to be wired, or the LEDs. I have MTA headers already soldered in so it's hard to follow the traces. Anyone know if there is a diagram around? Thanx
by deepblackjoe@gmail.com
Thu Dec 19, 2019 6:48 am
Forum: Music Tech DIY
Topic: Suiseki Phase Shifter
Replies: 3
Views: 747

Is there a chance those empty resistor spaces need to have links put in? Shot in the dark
by deepblackjoe@gmail.com
Tue Dec 17, 2019 8:27 pm
Forum: Music Tech DIY
Topic: Shift Register Major Droop
Replies: 6
Views: 337

Just to update those of you with the good tips, the asr is now locked in the way it should be! Guest - you were right about the cleaning, that did it. Maybe the red color pcb made it hard to see how fluxey it really was! Makes me wanna try that on a couple other things too. Sad to say I didn't reali...
by deepblackjoe@gmail.com
Tue Dec 17, 2019 1:11 pm
Forum: Music Tech DIY
Topic: Shift Register Major Droop
Replies: 6
Views: 337

Yes it is a steady droop, just constantly descending as it trills thru the voltages. I'll clean it off better, and try swapping one out to hear the difference. A little I can live with, but this is immediate and severe. I guess I am wondering if different cap materials allow more or less of that. My...
by deepblackjoe@gmail.com
Tue Dec 17, 2019 5:55 am
Forum: Music Tech DIY
Topic: Shift Register Major Droop
Replies: 6
Views: 337

Shift Register Major Droop

Hello, I'm hoping someone will have some insight on this. I built up two elby designs asr boards,one is panelled so far. There are four caps, c201-204, one next to each of the ca3140 opamps, and the bom calls for 100n polypropylene. Perhaps foolishly I substituted 100n mylar greenies here (on both b...
by deepblackjoe@gmail.com
Sun Dec 15, 2019 9:22 am
Forum: Music Tech DIY
Topic: Trouble with Stroh Pico Vco
Replies: 10
Views: 894

Wow, you nailed it. I had two 100ks in parallel instead of 10ks for the 4.99k (r4), you busted me on the color codes! I massacred that area trying to desolder but got it scabbed together. It's funny that the range seems pretty small, and the hf trimmer has no effect so far, but the tone from tri out...
by deepblackjoe@gmail.com
Sat Dec 14, 2019 6:50 pm
Forum: Music Tech DIY
Topic: Trouble with Stroh Pico Vco
Replies: 10
Views: 894

Well the voltage at the node of r4 and r5 was 12v (I'm making this for 12v supply) . I saw r5 was 6.8k instead of the 11k on the schematic so I pulled it, then realized that I had a small note to change that for 12v operation to 6.8k. I wonder if it should be something else while I have it out? Or l...
by deepblackjoe@gmail.com
Sat Dec 14, 2019 4:13 pm
Forum: Music Tech DIY
Topic: Trouble with Stroh Pico Vco
Replies: 10
Views: 894

I'm trying your ideas synthiq, and the tri out is at 9.5v with the lm311 out of circuit, and square is at 6.6v, and both are the same at the positive and negative inputs like you said. Before replacing u105 I bent pins 5 & 6 back and powered up, and they stay at 9.5 and 6.6. hmmm. Not sure what happ...
by deepblackjoe@gmail.com
Sat Dec 14, 2019 1:05 pm
Forum: Music Tech DIY
Topic: Trouble with Stroh Pico Vco
Replies: 10
Views: 894

I used mpf102. I'll see what I can see in these schematics. My version of Stroh Docs is missing this
by deepblackjoe@gmail.com
Sat Dec 14, 2019 9:58 am
Forum: Music Tech DIY
Topic: Trouble with Stroh Pico Vco
Replies: 10
Views: 894

Trouble with Stroh Pico Vco

Hello out there, if any of you has a moment to advise me on this, I'd really appreciate it. I've got this put together here, and it seems to not be oscillating. The led is lit, and the tri out says 9.2v, square is 8v,but no sounds. I tried messing with the trimmers but nothing seems to happen. All t...
by deepblackjoe@gmail.com
Thu Dec 12, 2019 4:20 pm
Forum: Music Tech DIY
Topic: Adding a fine tune knob?
Replies: 12
Views: 1089

Thanx for the bump. I finally got that tempco, and had the fine pot wired up as described above, in parallel and with a 3.3m resistor at the wiper , bench supply and alligator clips, and the led lit up, but no oscillations. All the chips are getting power where they should. Tried trimming every whic...
by deepblackjoe@gmail.com
Mon Dec 02, 2019 6:24 pm
Forum: Music Tech DIY
Topic: Adding a fine tune knob?
Replies: 12
Views: 1089

Thanx alot for the ideas, I think I should try both, really just to see. I'll set this up after din. I don't have the schematic, just the board populated, which reminds me I haven't got the tempco yet. Should be here any day tho. I'll let u know what works. Double cheers
by deepblackjoe@gmail.com
Mon Dec 02, 2019 4:10 pm
Forum: Music Tech DIY
Topic: Adding a fine tune knob?
Replies: 12
Views: 1089

Adding a fine tune knob?

To a Stroh Pico vco. There's probably several ways to go about it, but I could use some guidance. Can someone tell me a simple way to do this? I looked at my blacet vco schems but got confused. Maybe two different value pots in series somehow?
by deepblackjoe@gmail.com
Wed Apr 17, 2019 12:46 pm
Forum: Music Tech DIY
Topic: Why wash PCBs?
Replies: 30
Views: 2507

Let's say I have some modules working fine that I used Kester 331 on in the last year and didn't clean because I wanted to believe the "organic" flux would just be protecting the joints from oxidization, or just balked at the idea on running this device under the sinktap that normally you would neve...
by deepblackjoe@gmail.com
Wed Mar 06, 2019 9:06 am
Forum: Fractional Rack Modules
Topic: Frac mounting rails query
Replies: 1
Views: 1556

Frac mounting rails query

Hello people - got a question for ya. You know those u-shaped channel rails for mounting modules in a 19" rack, that you attach flat rack ears to the ends? Does anyone know where to find these? Someone gave me a few with some taken-apart Paia enclosures, but I need some more for two four-panel cases...
by deepblackjoe@gmail.com
Mon Feb 25, 2019 6:44 pm
Forum: Music Tech DIY
Topic: What Nut To Order??
Replies: 5
Views: 781

Thanx for the linx.
by deepblackjoe@gmail.com
Mon Feb 25, 2019 2:41 pm
Forum: Music Tech DIY
Topic: What Nut To Order??
Replies: 5
Views: 781

What Nut To Order??

This seems like such a quibbling question, but I've been all around town today trying to locate or even identify the nut that goes on an 1/8" jack. The latest batch I got has those little finger-tighten-only ones. The ones with the notches I don't really like either. I got a lot of the cheap jacks a...
by deepblackjoe@gmail.com
Sat Jan 12, 2019 1:29 pm
Forum: Music Tech DIY
Topic: Resistors Again...
Replies: 6
Views: 787

Resistors Again...

So my most recent forays into CGS have me ordering 1/2 watt 1% metal film. Sometimes I get lucky, but now I have them in three different sizes. I've squeezed some oversize ones into the VCS after reading that will be fine, and sprinkled some tiny ones here and there, but what size do I enter into th...
by deepblackjoe@gmail.com
Fri Dec 28, 2018 12:51 pm
Forum: General Gear
Topic: Vacuum Tube Query
Replies: 7
Views: 841

Thanx for the tip. Never heard of this phenomena. I bet you're right. Two 12AX7s ... bet I can swing for that. The Musicman however sounds like oldfashioned failure, but that can wait.
by deepblackjoe@gmail.com
Fri Dec 28, 2018 9:41 am
Forum: General Gear
Topic: Vacuum Tube Query
Replies: 7
Views: 841

Vacuum Tube Query

So I've been running the stereo mix from my frac setup thru an ART Pro VLA two-channel tube compressor but now something is happening I'd like to ask about if anyone has any ideas. All is well for a few minutes and then things start to sound mushy and then the meter will creep up and up on its own u...
by deepblackjoe@gmail.com
Fri Nov 16, 2018 5:42 pm
Forum: Synth Noise
Topic: What noise is to you...
Replies: 130
Views: 17911

the spiderweb that describes all the modulating halfwits in the mist. go in. inward
by deepblackjoe@gmail.com
Fri Nov 16, 2018 5:40 pm
Forum: Artist Discussion
Topic: My Top 3 Synth Albums, what are yours?
Replies: 111
Views: 13851

geoff mullen bongo closet. eno half of low. silverman dream cell. tough one...
by deepblackjoe@gmail.com
Fri Nov 16, 2018 5:36 pm
Forum: Music Tech DIY
Topic: Fully custom MFOS Soundlab Ultimate & Ultimate Expander
Replies: 11
Views: 1304

Beautiful!
by deepblackjoe@gmail.com
Fri Nov 16, 2018 7:34 am
Forum: General Gear
Topic: Just getting into music, looking for gear recommendations.
Replies: 51
Views: 2243

a sweet tube amp can really change things. or tube preamp warm it up

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