Search found 101 matches

by deepblackjoe@gmail.com
Sun Feb 07, 2021 6:48 pm
Forum: Music Tech DIY
Topic: Electrolytic voltage rating excess
Replies: 4
Views: 171

Re: Electrolytic voltage rating excess

Good to know, I'll just leave em in then. Thanks
by deepblackjoe@gmail.com
Sun Feb 07, 2021 8:17 am
Forum: Music Tech DIY
Topic: Electrolytic voltage rating excess
Replies: 4
Views: 171

Electrolytic voltage rating excess

I've been populating a small raft of pcbs, and realized that the 10uf electrolytics a I'm using are rated for 100v instead of the usual 50v I get. I have a +/-15 v supply. I'm under the impression that it's fine, they'll last longer,etc, but this is many times higher. The teezer vco has 6 of these, ...
by deepblackjoe@gmail.com
Wed Jan 06, 2021 8:23 pm
Forum: Music Tech DIY
Topic: Teezer 15v build question
Replies: 13
Views: 1588

Re: Teezer 15v build question

Thanks for that, will go ahead and keep the ferrites. While I have your ear Ian(!), How important is the power dissipating rating in zener choice? I only ask because all on hand are the 1n4xxx type..and the higher rating I think, but maybe there are situations where less is desirable, like the 1n5xx...
by deepblackjoe@gmail.com
Wed Jan 06, 2021 2:57 pm
Forum: Music Tech DIY
Topic: Teezer 15v build question
Replies: 13
Views: 1588

Re: Teezer 15v build question

I dredged this one up instead of starting a new thread. I'm building a 4u teezer pcb for 15v. I started with all the resistors, including Dave Brown's subs, and got to the zeners. Mr Fritz's addendum says to swap out the six ferrites for various zeners to accommodate 15v operation, and Dave has four...
by deepblackjoe@gmail.com
Sun Dec 13, 2020 4:17 am
Forum: Music Tech DIY
Topic: Ca3280e replacement in T.N.A.
Replies: 2
Views: 136

Re: Ca3280e replacement in T.N.A.

Although I'm sure it gets real hott in the Agonizer sometimes, I'll take my chances with the a variant. Thanks
by deepblackjoe@gmail.com
Sat Dec 12, 2020 10:33 pm
Forum: Music Tech DIY
Topic: Ca3280e replacement in T.N.A.
Replies: 2
Views: 136

Ca3280e replacement in T.N.A.

Hello everyone. I'm collecting all the things to put together a Tellun Neural Agonizer, and assume a few of you have taken this one on, Do I need to use only the e variant in this, or is the reissue 3280 a drop in replacement? There are also many precision opamps in all the input amplifiers, 7 each ...
by deepblackjoe@gmail.com
Wed Nov 04, 2020 3:50 pm
Forum: Fractional Rack Modules
Topic: update on Blacet kits migration to synthCube
Replies: 44
Views: 2426

Re: update on Blacet kits migration to synthCube

Replacement pcbmount pots is something I was going to ask you about. I have a couple on the mixer that might need more than cleaning. I would preemptively buy some extras if/when you find something suitable. Thanx for keeping blacet alive!
by deepblackjoe@gmail.com
Wed Sep 23, 2020 3:07 pm
Forum: Music Tech DIY
Topic: Time Machine malfunction
Replies: 15
Views: 540

Re: Time Machine malfunction

Do tell.
by deepblackjoe@gmail.com
Fri Aug 21, 2020 9:02 am
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 532

Re: Hcc15-3-ag power supply odd behavior

Just had the headphones on for about an hour, and have been unable to recreate my troubles. Must have been some kind of user error, something with the stepped LFO and the different invert stages. Thanks for the ideas, it led me to some good study. And the busbars idea altogether! IMG_20200820_104256...
by deepblackjoe@gmail.com
Thu Aug 20, 2020 5:55 am
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 532

Re: Hcc15-3-ag power supply odd behavior

Well I have finished reassembling the two cases, with the 3a in one and 3ag in the other, with a blacet ps800 handling about a third of the modules in with 3ag, the hungriest ones. The 3ag still has some false starts, but maybe I'll just live with it for now. I have yet to connect any of their commo...
by deepblackjoe@gmail.com
Tue Aug 18, 2020 2:52 pm
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 532

Re: Hcc15-3-ag power supply odd behavior

Well the schottkeys don't do it. I had 5817 not 19. I ended up putting an extra small supply in with the 3ag to handle what the 3ag couldn't. I filled up the second case with my older 3a supply and it seems to handle more without latching up, which begs the question... I'm going to go back and chang...
by deepblackjoe@gmail.com
Tue Aug 18, 2020 6:31 am
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 532

Re: Hcc15-3-ag power supply odd behavior

This is more in the vein of what I suspect is happening. I think all the modules I've built have 10uf there, which is most of them. I'd much rather try this than squeeze another small supply/busboards in there, starts defeating the purpose of these new cases. I have some of those on hand, so will tr...
by deepblackjoe@gmail.com
Mon Aug 17, 2020 4:53 pm
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 532

Re: Hcc15-3-ag power supply odd behavior

Uh oh I do have ferrites and electrolytics on just about every module! Habit I picked up from cgs builds, never thought it would come back to bite me. Maybe I should switch most of those out with 20r resistors, the more accessible ones, and see if that helps, probably don't need most of the ferrites...
by deepblackjoe@gmail.com
Mon Aug 17, 2020 8:52 am
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 532

Re: Hcc15-3-ag power supply odd behavior

If I am using the cases together, which I imagine will be most always, would I then earth only in one side or the other? It would be easy enough to do both if preferable. I've fitted a 4 pin XLR jack next to each inlet , with all 4 pins connected to the common bar with 18 awg just a couple inches lo...
by deepblackjoe@gmail.com
Sun Aug 16, 2020 6:23 pm
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 532

Re: Hcc15-3-ag power supply odd behavior

Well I couldn't find the derate detail in the power one lit, not yet. I tried to figure out the current draw for the five 19" racks hooked up in the one case so far and it's about 1.4a, knowing about 2/3 of them, and guestimating the rest. There's one more I was hoping to add, case being six high, i...
by deepblackjoe@gmail.com
Sun Aug 16, 2020 7:46 am
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 532

Re: Hcc15-3-ag power supply odd behavior

One thing is the inlet is at the bottom and the supply at the top. I used 18 awg because I had it, not thinking it mattered. It's almost three feet long. Should I fatten this up to 14? I also didn't use those star washers under the ring to cut thru the oxide layer on the bar.. is this essential? I d...
by deepblackjoe@gmail.com
Sun Aug 16, 2020 7:01 am
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 532

Re: Hcc15-3-ag power supply odd behavior

I thought of something I need to add. At one point I had all these but one plugged in, and it turned on fine. Once or twice. I thought it would maybe help to triple up the wires from the posts to the busbars, and connect them to the middle of the bars instead of the end, but get the same behavior.
by deepblackjoe@gmail.com
Sun Aug 16, 2020 6:53 am
Forum: Music Tech DIY
Topic: Hcc15-3-ag power supply odd behavior
Replies: 23
Views: 532

Hcc15-3-ag power supply odd behavior

So I'm putting together my first busbar system. I got a new power one, tapped out the bars, and wired it up after much reading, and everything looked good,. Hooked up a few modules, cycle power a few times, add a few more. Not getting hot, add a few more. I got up to about 3 racks, and then flip the...
by deepblackjoe@gmail.com
Thu Jul 16, 2020 6:51 pm
Forum: Music Tech DIY
Topic: Stepup Transformer with Tascam
Replies: 20
Views: 908

Re: Stepup Transformer with Tascam

Would a 3 prong 12 v wall wart help me? I failed to take this into consideration, as the 220 has two. I know this is unorthodox, but 220 is new to me
by deepblackjoe@gmail.com
Thu Jul 16, 2020 4:41 pm
Forum: Music Tech DIY
Topic: Stepup Transformer with Tascam
Replies: 20
Views: 908

Re: Stepup Transformer with Tascam

Yes it is... Wonder if there's a way to make it possible
by deepblackjoe@gmail.com
Thu Jul 16, 2020 12:11 pm
Forum: Music Tech DIY
Topic: Stepup Transformer with Tascam
Replies: 20
Views: 908

Re: Stepup Transformer with Tascam

Well I ended up getting a supposed pure sine inverter that puts out 220 at 50 hz like the 244 wants, and hooked it up to a 12v wall wart. I check with the meter, 217 v. So I plug it in and turn it on, all the meters light up, counter at zero, but a very loud hum on the headphones. A look at the fine...
by deepblackjoe@gmail.com
Sun Jul 05, 2020 1:46 pm
Forum: Music Tech DIY
Topic: Stepup Transformer with Tascam
Replies: 20
Views: 908

Re: Stepup Transformer with Tascam

Thanx for your insight Graham. I had a look at the service manual, and see there are five different transformers, uk, USA, Japan, Europe, and general export. Let's say I got a parts machine, which I am considering anyway; could the trans NOT be a drop-in replacement if there were differencs elsewher...
by deepblackjoe@gmail.com
Sun Jul 05, 2020 4:26 am
Forum: Music Tech DIY
Topic: Stepup Transformer with Tascam
Replies: 20
Views: 908

Re: Stepup Transformer with Tascam

What about a pure sine inverter that takes 12 v DC and puts out 220 at 50hz? Any reason not to wire this up to a wall wart? I'm seeing more of this kind of thing.
by deepblackjoe@gmail.com
Sun Jul 05, 2020 3:24 am
Forum: Music Tech DIY
Topic: Stepup Transformer with Tascam
Replies: 20
Views: 908

Re: Stepup Transformer with Tascam

Well I opened up the back of the machine and there is no changeover switch. Dammit. The sticker says 220 v 50 hz 30 watt. How does one go about converting the freq from 60 to 50? I looked around and saw only industrial application ($) type units. One smaller one came up that says it handles 50/60 "a...

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