Shared Projects by theepicureanshoppe

use this to adapt a MMBF5457 (or any compatible footprint SMD JFET) to through-hole. 4 different through-hole pads available for various footprint options. The pin spacing is 1.27mm, so a right angle pin header like this Harwin PN# M50-3930342 should work quite well: https://www.digikey.com/short/w3mb8p70 (also available on Mouser, but sold out at the time of this writing) but honestly, I’d just bend clipped wire leads.

use these to solder a SOIC-8 SMD package IC to DIP-8 pinout. Use 2x 2.54mm 4-position pin headers on each side of the PCB such as Amphenol G800W304018EU (https://mou.sr/3BHwqux) or Adam Tech PH1-04-UA (https://mou.sr/3IQ25uh).

If you plan on using this board with machined sockets, I’d suggest using “machined” round / circular pin headers instead of the standard “box” ones listed above. Here’s a seller with some nice ones for cheap: https://protosupplies.com/product/header-machined-round-pin-male-1x40/

NOT FOR RESALE / OPEN SOURCE / NOT FOR COMMERCIAL PURPOSES.

A simple and easily adaptable little PCB to drive audio to a VU meter, complete with AC/DC rectifier and voltage regulator scheme. All through hole parts and simple values that most people should have in their parts drawer.

README!! / build info: https://docs.google.com/document/d/1bu64g2G1ggHc6OshrWSmoz3sX_fiJMnXoEh3ND_-yd0/view

Schematic: https://drive.google.com/file/d/1WHfSMMSNJ5zRZPLyEeUI4-zhi375XI5M/view

BOM / Partslist: https://docs.google.com/spreadsheets/d/13xRC2moRkIAikeBnX3xfViB94S35QPKQK3rxiuA7M9U/view

A simple and easily adaptable little PCB to drive audio to a VU meter, complete with AC/DC rectifier and voltage regulator scheme. All through hole parts and simple values that most people should have in their parts drawer.

README!! / build info: https://docs.google.com/document/d/1bu64g2G1ggHc6OshrWSmoz3sX_fiJMnXoEh3ND_-yd0/view

Schematic: https://drive.google.com/file/d/1WHfSMMSNJ5zRZPLyEeUI4-zhi375XI5M/view

BOM / Partslist: https://docs.google.com/spreadsheets/d/13xRC2moRkIAikeBnX3xfViB94S35QPKQK3rxiuA7M9U/view

You can use this little board to adapt a Bourns 3296W (or Vishay T93YA) trimpot as a bias adjustment control in a tube amplifier. The bias supply from the amp goes to “B.IN” pad, bias supply out comes from the “B.OUT” pad, and the “G” pad goes to the main bias resistor to ground depending on the circuit. The resistor in parallel is an emergency pull-down resistor. I took this idea from the Valve Wizard. They write: “This ensures that if the pot wiper fails to make good contact with the rack (because it is dirty or worn out, say) the grid leaks will effectively be connected directly to the raw bias supply through R1 instead, biasing the valves safely cold. R1 should have a value of about ten times [the trim pot] so it has negligible effect on the rest of the design.”