Ive designed boards for a little module that is supposed to provide regulated bias and regulated 6.3/12.6VDC at up to 3A continuous. for use in tube amplifiers.
The regulated bias is with a TL783 that will accept up to 125VDC in. and should provide -40 to -80V adjustment range on the bias supply.
The LD1085 supply is SB560 skotkey rectified, and should be able to produce 6.3VDC from 7VAC using a 6800uF cap
The board has a substantial heatsink of 2.3K/W because i stocked up on those. dimensions are 78x50x40mm.
Mechanically the board is about 120x50mm with M4 mounting holes from the side. The cooler mounts on the back, so do the capacitors, at the top and bottom of the board. The parts on top of the board are low profile, so the board can be mounted with the SMD parts down.
Suggested price for the boards alone is €2,50. The cooler including mounting hardware is €5 And a complete kit with the SMD parts soldered should cost around €25 excluding postage.
The board can be used to mark out the six m3 holes that need to be tapped into the heatsink.
Any interest?
The regulated bias is with a TL783 that will accept up to 125VDC in. and should provide -40 to -80V adjustment range on the bias supply.
The LD1085 supply is SB560 skotkey rectified, and should be able to produce 6.3VDC from 7VAC using a 6800uF cap
The board has a substantial heatsink of 2.3K/W because i stocked up on those. dimensions are 78x50x40mm.
Mechanically the board is about 120x50mm with M4 mounting holes from the side. The cooler mounts on the back, so do the capacitors, at the top and bottom of the board. The parts on top of the board are low profile, so the board can be mounted with the SMD parts down.
Suggested price for the boards alone is €2,50. The cooler including mounting hardware is €5 And a complete kit with the SMD parts soldered should cost around €25 excluding postage.
The board can be used to mark out the six m3 holes that need to be tapped into the heatsink.
Any interest?
Attachments
Thats enough interest to at least order a run of 10. il put the Pcb's in my basket. I have most of the components on stock, but PM me for details.
-80V bias is enough for everything but transmitter tubes in my experience. the TL783 will operate with 125V input-output differential maximum, that limits the AC in to about 80VAC. If you remove the cap on the output input output differential can be exceeded slightly because the regulator wont see a dead short on its output during start-up.
-80V bias is enough for everything but transmitter tubes in my experience. the TL783 will operate with 125V input-output differential maximum, that limits the AC in to about 80VAC. If you remove the cap on the output input output differential can be exceeded slightly because the regulator wont see a dead short on its output during start-up.
I havent ordered them yet, i will include a 5W 100V zener over the TL783 regulator. Im however thinking of revamping the board to a easier format to assemble.
Heres the revamped board, this one doesnt require drilling a heatsink but uses an of the shelf part. SK129 available in 30 to 50mm height.
You can opt to take either of the boards, this one ive just drawn is through hole so everyone can assemble it.
The board measures 50x150mm and has M4 mounting holes 5mm from the corners. the schematic is virtually identical except for the fact i added TO220 diodes, as i have found some very low drop skottkeys in that package.
The price for the boards is €3 each, these are slightly larger.
If you want me to make any changes, feel free to comment, or if you prefer the original board thats also fine with me.
You can opt to take either of the boards, this one ive just drawn is through hole so everyone can assemble it.
The board measures 50x150mm and has M4 mounting holes 5mm from the corners. the schematic is virtually identical except for the fact i added TO220 diodes, as i have found some very low drop skottkeys in that package.
The price for the boards is €3 each, these are slightly larger.
If you want me to make any changes, feel free to comment, or if you prefer the original board thats also fine with me.
Attachments
still havent had the time to put in an order with JLC, ive had a lot on my plate. PM if you want me to send you the Gerbers for free.