What’s on *YOUR* workbench?

Well… this arrived today:
Hammond 14”x8” console with walnut sides.
Sooooo.. I guess I’m gonna need a reasonable power supply for what’s in store… pretty much dumping all my GuitarPCB modulation/delay/reverb boards into it.

Need a good flanger circuit and it would theoretically cover all modulation needs. We shall see.
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Boyle's¬Law #002 is done! Turns out that an LM393A comparator is NOT an acceptable substitute for an RC4558P. Oops. Some of my IC tubes got mixed together. Build report later - I socketed transistors and want to compare noise on a few choices.

I am going to jump away from the two PCB's for which I have cases, though, and build the latest arrival, a PedalPCB Seabed Delay. 'Cause I want to play around with delay, and the only one I have is a 1980's Ibanez DMD2000 rack unit (which is cool and super flexible, but not exactly portable or easy to move around a signal chain).

I checked my WIP boxes and the count of unbuilt boards is 24. I think the Seabed should go quickly, as long as I have the parts.

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JasonWickersham said:
Well… this arrived today:
Hammond 14”x8” console with walnut sides.
Sooooo.. I guess I’m gonna need a reasonable power supply for what’s in store… pretty much dumping all my GuitarPCB modulation/delay/reverb boards into it.

Need a good flanger circuit and it would theoretically cover all modulation needs. We shall see.
View attachment 107137
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Very nice looking. Who do you buy through?
 
jimilee said:
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About 10K worth of damage.

The unit controller (that's an AD MAX3430 IC, an RS485 interface), the Lenze VFD for the supply fan (through which the fault occured due to the pitiful isolation between the RJ45 jack and the analog output terminal block), and the Danfoss VFD for the DX compressor.

The Danfoss compressor is modular: I was pushing to have them just let me swap the I/O control board...cause the only thing that was wrong with it was the fact that it couldn't send or receive anything on its RS485 bus. Woulda been 1/10th of the cost. But...even though it's designed to be easy to service, the distributor didn't have any means of legitimately sourcing that component.

Insanity. Brand new unit, our controls guys decided to tie into the same 40va 24vac transformer that powered the unit's controls.

Well...that transformer had a common leg that was bonded to ground. Which meant that their controller's DC negative was 12vac to ground.

I found one crispy resistor on the Lenze VFD that tells part of the tale...between the grounded pins of the RJ45 modbus plug and the analog output "common".

What I don't quite understand yet is why it took a little time after they wired it for the fault to become apparent...and how that AC potential ended up making its way over to the RS485 modbus network.

Replaced the lenze VFD yesterday. Gonna poke around that circuit board and see what I can find.
 
Stickman393 said:
About 10K worth of damage.

The unit controller (that's an AD MAX3430 IC, an RS485 interface), the Lenze VFD for the supply fan (through which the fault occured due to the pitiful isolation between the RJ45 jack and the analog output terminal block), and the Danfoss VFD for the DX compressor.

The Danfoss compressor is modular: I was pushing to have them just let me swap the I/O control board...cause the only thing that was wrong with it was the fact that it couldn't send or receive anything on its RS485 bus. Woulda been 1/10th of the cost. But...even though it's designed to be easy to service, the distributor didn't have any means of legitimately sourcing that component.

Insanity. Brand new unit, our controls guys decided to tie into the same 40va 24vac transformer that powered the unit's controls.

Well...that transformer had a common leg that was bonded to ground. Which meant that their controller's DC negative was 12vac to ground.

I found one crispy resistor on the Lenze VFD that tells part of the tale...between the grounded pins of the RJ45 modbus plug and the analog output "common".

What I don't quite understand yet is why it took a little time after they wired it for the fault to become apparent...and how that AC potential ended up making its way over to the RS485 modbus network.

Replaced the lenze VFD yesterday. Gonna poke around that circuit board and see what I can find.
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Whelp...figured part of it out.

"negative DC common" on the BMS controller became common with MODBUS A/B on the supply fan VFD.

Something in that circuit board failed closed. Multiple somethings.
 
jwin615 said:
Something about those first few days of December
View attachment 107206
Happy to see yeah trudging through it some more for the greater good man. Not sure what the Death Spiral is but that layout is niiiiice.
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The Death Spiral is the only finished one from that old pic (it's a 12 stage phaser). My burnout this year was pretty bad but I'm in a new building mood. Gotta get that Synthwave done. I'm touching everything this month, at least.
 
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