The boards were designed over many years, following the discussion on this thread
https://www.diyaudio.com/community/threads/technics-sl-1200-dc-power-supply.238618/
The PSU is a full rectifier bridge, followed by a quasimodo snubber, and then a CRC filter. It functions as any usual PSU board and two of them can be bridged easily for dual voltages
The regulator pcb provides an 8mm entry hole for a DC socket (or even a plain RCA one), which falls over the existing entry hole on the chassis.
It uses a 1A PPTC fuse to protect everything, followed by the last RC stage, and then the LM317 regulator. The output can be wired with a screw terminal for easy testing. And it also provides leds and test points for easy checking of the voltages around the regulator.
I currently have 11 sets of PCBs
Price is 25 euros for a set of two boards (one regulator and one PSU), including tracked and signed-for shipping to EU or the US.
Sorry to everyone else, I will not ship outside those two.
I will order more if there is enough interest.
Below you can see the schematics and BOMs for the two boards.
Give me a ping if you need more info
Regulator Schematics:
Regulator BOM and Notes: https://www.howtic.com/wp-content/uploads/2024/09/ibom-sl1200_entry-v.1.0.2024.p.html
PSU Schematics:
PSU BOM and Notes: https://www.howtic.com/wp-content/uploads/2024/08/ibom-PSU-small-v.1.1.2024.p.html
https://www.diyaudio.com/community/threads/technics-sl-1200-dc-power-supply.238618/
The PSU is a full rectifier bridge, followed by a quasimodo snubber, and then a CRC filter. It functions as any usual PSU board and two of them can be bridged easily for dual voltages
The regulator pcb provides an 8mm entry hole for a DC socket (or even a plain RCA one), which falls over the existing entry hole on the chassis.
It uses a 1A PPTC fuse to protect everything, followed by the last RC stage, and then the LM317 regulator. The output can be wired with a screw terminal for easy testing. And it also provides leds and test points for easy checking of the voltages around the regulator.
I currently have 11 sets of PCBs
Price is 25 euros for a set of two boards (one regulator and one PSU), including tracked and signed-for shipping to EU or the US.
Sorry to everyone else, I will not ship outside those two.
I will order more if there is enough interest.
Below you can see the schematics and BOMs for the two boards.
Give me a ping if you need more info
Regulator Schematics:
Regulator BOM and Notes: https://www.howtic.com/wp-content/uploads/2024/09/ibom-sl1200_entry-v.1.0.2024.p.html
PSU Schematics:
PSU BOM and Notes: https://www.howtic.com/wp-content/uploads/2024/08/ibom-PSU-small-v.1.1.2024.p.html
I have been stashing these for some time, and it's probably time to make some room for new experiments. All are fully functional, but for various reasons I replaced them with other boards.
From top left, we have
1) SL1200 MK2 regulator board with dual LM7820 or chips with that pinout
2) The final test version of my LM317 SL1200MK2 regulator board. It's functionally identical to the ones described in the link below, just without the screw terminal footprint and with a couple of experimental components that were removed in the final version (5x20mm fuse, C4)
https://www.diyaudio.com/community/threads/sl1200-mk2-regulator-and-psu-boards.417506/
3) Same as 1, with a curve that follows the chassis, and a brace that can push the LM7820 to the aluminum pad (with proper washers on the screws that keep the board to the chassis
4) Simple full wave rectifier, quasimodo snubber and CRC psu board 50x100mm (footprint between the caps can be ignored)
5) Same as 4, but slightly smaller 45x95mm (footprint between the caps can be ignored)
6) Dual version of 4 (footprint between the caps can be ignored). It has no v-cut, so the two sides cannot be separated.
Price is 5 euros per board, plus 10 euros for tracked and signed-for shipment to EU or US. Sorry I will not ship to countries outside those two
Let me know if you need any clarifications
From top left, we have
1) SL1200 MK2 regulator board with dual LM7820 or chips with that pinout
2) The final test version of my LM317 SL1200MK2 regulator board. It's functionally identical to the ones described in the link below, just without the screw terminal footprint and with a couple of experimental components that were removed in the final version (5x20mm fuse, C4)
https://www.diyaudio.com/community/threads/sl1200-mk2-regulator-and-psu-boards.417506/
3) Same as 1, with a curve that follows the chassis, and a brace that can push the LM7820 to the aluminum pad (with proper washers on the screws that keep the board to the chassis
4) Simple full wave rectifier, quasimodo snubber and CRC psu board 50x100mm (footprint between the caps can be ignored)
5) Same as 4, but slightly smaller 45x95mm (footprint between the caps can be ignored)
6) Dual version of 4 (footprint between the caps can be ignored). It has no v-cut, so the two sides cannot be separated.
Price is 5 euros per board, plus 10 euros for tracked and signed-for shipment to EU or US. Sorry I will not ship to countries outside those two
Let me know if you need any clarifications
@Moderation Team
Thanks for merging the two posts. Can you please remove the "test" from the title? Not all pcbs are tests now
Thanks for merging the two posts. Can you please remove the "test" from the title? Not all pcbs are tests now
