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...

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...

Although I'm sure it gets real hott in the Agonizer sometimes, I'll take my chances with the a variant. Thanks

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 ...

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!

Do tell.

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...

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...

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...

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...

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...

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...

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...

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...

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.

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...

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

Yes it is... Wonder if there's a way to make it possible

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...

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...

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.

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...

Does that mean I can go ahead and plug it in? It's from the early or mid 80's I think. I just don't want to fry anything. The fuse wouldn't help me right? I wonder if all those cheap transformers are just 240 with no way to switch.

Thanks for the breakdown. I checked the wall out of curiosity, 117. I should probably ask tascam or just return this transformer and get actual 220. I thought I'd be able to open and adjust it with a jumper or something because it says it'll do both, but the screws are glued in or something. Guess I...