36v where/how? From V- to V+? That’s fine. From ground to V+? That’s bad...
Disconnect the preamp from the PSU. With the black probe on GND and poking around with the red, what is the DCV at V+ and the DCV at V-?
Disconnect the preamp from the PSU. With the black probe on GND and poking around with the red, what is the DCV at V+ and the DCV at V-?
All good I see the error in my ways, from reference to ground I have 18 V+ on one side and 18 V- on the other.
I am however exceeding the Salas boards max input by 6 volts, could have done a little more thinking in that regard.
I am however exceeding the Salas boards max input by 6 volts, could have done a little more thinking in that regard.
There's an LM7812 regulator chip on the selector board that fixes at 12V any higher raw or regulated DC line attached to its DC-IN power input connector. So no worries, the relays will not see higher than nominal working voltage in the end.
I need a couple of recommendations for a motorized pot, a kit would be great. I cant afford the esoteric platinum-dream anything..... just a good match for this project in the US
To bounce off mareli's helpful advice, I've taken the liberty of expanding the original sketch in Post #1991 and reflect it back here for comment. I'm finding my way when it comes to wiring up boards for balanced operation. I've scoured the thread and there's a bit of confusion that pops up because Wayne's clever design permits Balanced In->SE Out.
I'm interested in Balanced In->Balanced Out and that is what the sketch seeks to describe from input to output. Subsequently, I'm seeking input from those more knowledgeable with the plan of avoiding frustration, a melt down or a magic smoke party after the solder has cooled and the power gets turned on.
The sketch includes reference to source documents where relevant for clarity and added notes to suit. Hopefully, this will help another person like myself who's dipping their toe in balanced waters.
Constructive thoughts please. Thanks..
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Thank you for the answer Wayne. So that I don't screw this up, can you help me understand how the feedback resister and the input resister map to the schematic please? I assume the 10K to ground is R17.
To bounce off mareli's helpful advice, I've taken the liberty of expanding the original sketch in Post #1991 and reflect it back here for comment. I'm finding my way when it comes to wiring up boards for balanced operation. I've scoured the thread and there's a bit of confusion that pops up because Wayne's clever design permits Balanced In->SE Out.
I'm interested in Balanced In->Balanced Out and that is what the sketch seeks to describe from input to output. Subsequently, I'm seeking input from those more knowledgeable with the plan of avoiding frustration, a melt down or a magic smoke party after the solder has cooled and the power gets turned on.
The sketch includes reference to source documents where relevant for clarity and added notes to suit. Hopefully, this will help another person like myself who's dipping their toe in balanced waters.
Constructive thoughts please. Thanks..
I have pin 1 wired to power supply ground, not chassis. On my build wiring it this way eliminated all audible hum.
Power Supply Current Delivery Capacity
So, to be clear, then a single stereo board to output SE service would come to double this number ('ish)? Worst case.
Furthermore - for a balanced stereo build, and accounting for this basis, I'd be looking at a supply that can deliver ~400 mA to accommodate probable worst case duty. Sound about right?
So, to be clear, then a single stereo board to output SE service would come to double this number ('ish)? Worst case.
Furthermore - for a balanced stereo build, and accounting for this basis, I'd be looking at a supply that can deliver ~400 mA to accommodate probable worst case duty. Sound about right?
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Helios Bi-Polar PSU (REV B)
Hey guys just a quick heads up that I have now finished REV B of my Bi-Polar PSU boards. The official name is Helios. More info below:
Meet Helios! Bi-Polar power supply REV B boards coming soon! – audiosy.net
Hey guys just a quick heads up that I have now finished REV B of my Bi-Polar PSU boards. The official name is Helios. More info below:
Meet Helios! Bi-Polar power supply REV B boards coming soon! – audiosy.net
Awesome re outputs.
I applied power & it works great...dead silent. Ran for a couple hours on the test system
and delighted by the bass. Adjusted outputs to as close to zero..it’s sensitive for sure...moves around +/- but pretty stable. I can blow on the board and it changes.
I’ll splice into main sys and see what it does...great stuff y’all are sharing here..Thanks
I applied power & it works great...dead silent. Ran for a couple hours on the test system
and delighted by the bass. Adjusted outputs to as close to zero..it’s sensitive for sure...moves around +/- but pretty stable. I can blow on the board and it changes.
I’ll splice into main sys and see what it does...great stuff y’all are sharing here..Thanks
Attachments
I wonder if that sensitivity would improve (be less vulnerable to a breeze) if the rail voltage was higher?
What is the proper way to set DC offset when you dont follow instructions and totally complete your build?