The Psu PCB is available in my shop:

https://www.diysynth.de


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.

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

for SW1: don't use the MTA header- connect the cable directly.

the 3pole PSU Connector for the Yamaha PA30 is available on TME. FC684203



Build:

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


for the switch  SW1 - don't use a header - connect directly cables to SW1.

use the trimmer to get the correct voltage


wiring for Sw1:




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 - you need for F1 and F2 750-800mA fuses,

normally FAST blow fuses are not good in this circuit, please use medium or slow blow fuse types !!

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)


Schematic:

Schematic_PSU_rev0.9_2020-11-02_19-11-13.pdf


Example for TTSH installation:

the case of the TTSH is used as a cooling block



Heres´an example of an isolated Installation with Glimmer and plastic rings - its important that both voltage regulators are isolated - there's also a plastic inlet on bottom of the nut which isolated the screw from the voltage regulator body.





8 Comments

  1. If using a 15-0 15-0 toroidal transformer , does the two 0v go to the middle two connections , the two 15vAC wires go to AC and AC1 , or shall I wire the transformer as a centre tap 15-0-15 , and take the 0v two one of the middle terminals

  2. Thank you , two PCB`s purchased

    Just to make sure , you said yes to

    1: If using a 15-0 15-0 toroidal transformer , does the two 0v go to the middle two connections , the two 15vAC wires go to AC and AC1

    2: Or shall I wire the transformer as a centre tap 15-0-15 , and take the 0v to one of the middle terminals

    1. It’s the same .

  3. one more question , the PSU works great , but if I need to get it to +- 12 volts , ( the minimum I can get is 14.45v) what would I have to do

    1. you have to change the resistors, which select the voltage of the regulators.

      http://www.reuk.co.uk/wordpress/electric-circuit/lm317-voltage-calculator/

      same for Lm337

  4. Hi, TTSH V4 front panel uses SPDT rocker switch CWT12AAS1. Do you know of a suitable DPDT / DPST switch with similar dimensions (no front panel modification needed), that could be used with BIPO? / have you used switch with different dimensions?