OSH Park
Profile for AudioGeek
Shared projects
Dual Triode Adaptor Board
by
AudioGeek.
2
layer board of
2.05x1.40
inches
(52.10x35.56
mm).
Shared on
May 8th, 2015 03:07.
Plug a dual-triode vacuum tube (12A*7) into a breadboard. Or do it dead bug style with the screw terminals. Yay.
Add 0.5" hex standoffs to rear holes to support tube/board weight when plugged into breadboard.
I have used this board a bunch on a recent project, and it really beats soldering a bunch of wires to the pins of a plain tube socket!
LM386 Audio Amp
by
AudioGeek.
2
layer board of
0.97x0.75
inches
(24.66x19.05
mm).
Shared on
May 8th, 2015 03:06.
LM386N-3 chip audio amplifier PCB. I power this with 12V DC (Add a 100µF electrolytic filter/smoothing cap across the DC power input if using a wall wart). The other values are:
R1 10 Ω ½W metal film resistor
C1 0.1 µF 50V electrolytic capacitor (or a ceramic or film cap)
C2 0.047 µF 100V box film capacitor
C3 330 µF 16V electrolytic capacitor
I have used this PCB in a couple of projects and it works well. Low noise and very compact. It operates in 20x mode (You can always bodge on a 10µF electrolytic between pins 1 and 8 if you want noisy 200x mode).