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I reworked a PSU design, because the most bipolar psu pcbs doesn't match with my requirements.

This Psu is great in combination with an Yamaha PA-30, perfect for the TTSH  - no EMV problems or hum from the switching DC solution and no hum on the reverb.

The Yamaha PA-30 gives you around 700mA on 15V and 700mA on -15V.

Inputs and Outputs are mechanical very stable and the pcb can be attached by 6 Screws.

a DPDT switch connect/disconnect the power (a standard MTA156 4 pole header is used here)

The Voltage regulators can be mount directly (with isolation/glimmer  pads) on a metal case like the TTSH or with cooling frames.


you can use MTA100 headers instead of the LEDs - to connect 1 or 2 external Led holder in your device.


Its important to double check every rectifier/diode and capacitor and your wiring before you test the circuit.





BOM: (09.Aug.2020)

BOM_PSU_rev1.1_2020-08-09_17-15-03.xls

Build:

just install all parts from the BOM. use Glimmer(isolation) in case you attach both regulators to the same metal/cooler


use the trimmer to get the correct voltage

Fuse sizing:

use at the input fuses (F1/F2) the value which your AC-AC transformer offer - for the Yamaha PA.30 its max. 750mA (500mA/630mA should be fine)

for the secondary fuse use a value which is 10-20% bigger than what your device ask (for example a TTSH works great with 2x  500mA fuses and should be work with a 320mA too (depends on the additional mods)




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