What we need
For the MIDI-interface:
1x MAX 232 CPE (the variant ECPE have a protection against
overvoltage up to 15 kV)
4x 22µF/16V
2x 220 Ohms
1x 4,7 kOhms (5k)
1x doublerowed pinconnector 2x13
solder connectors
For the powersupply:
rectifier
(At the PCB shall be one, that have a pinscreen of 5,08 mm. The
inputpin shall be the two in the middle. That is a type of 4 Ampere.)
For example type: KBU4B (4A / 100 V)
3x 470 µF/25V standing
2x 2200 µF/25 V standing
3x 220 nF
1x1,5 kOhms
Transistor
1x BD136 or similar pnp-transistor
Zehner-Diode
1 x 12 V (for example: BZX79/12 o.s.)
controller-IC's
1x 7812
1x 7805
For the controller-IC must be a cooling. I think a aluminiumsheet 2mm
thickness 60 cm² ( 10x6 cm ) is enough.
For making the PCB:
- transparentpaper (for the exposuremask)
- a piece of 6 x 10 cm fotopositv PCB-material
- a UV-lamp (a normal flourescent lamp does the same)
exposure time with UV-lamp : 3 min
exposure time with flourecent-lamp : 7-8 min
(a small distance between lamp and PCB is necessary)
- developer for the exposured PCB: NaOH
- corrosive for the developed PCB: FeCl3 or other