OPCOM's Project Files:
Some Things you can do with Electronics


Computer Improvement:
Better Cooling for the DEC Alpha XL300 workstation and other computers
Better Cooling for the DEC Alpha XP1000 workstation and other computers

Tube Amplifiers:

new a switch circuit to select between cathode feedback and normal mode in an amp
Amplified PC-Speaker. One-tube!
Build your own Tube-Type Mobile Audio Power Amplifier
Build a Balanced low-Z mic/line amp with TUBES
Improving the RCA MI-12188A Public Address Tube Amp
Improving the Stromberg-Carlson APH-1050 Public Address Tube Amp
Improving the Stromberg-Carlson AP-80 Public Address Tube Amp
Improving the Stromberg-Carlson AP56 and AP55 Public Address Tube Amps
Schematic for the Stromberg-carlson APH-1200 Public Address Amplifier
Spec's for the Bogen MO-200 200 watt tube amp, and a few comments on it.
Cosmetic Improvements and Restoration for Rusty Old Equipment, How-To
A Class-D Tube audio amp? An experiment for sure.. unlike the other stuff, probably doesn't work, just an idea.

Radio Transmitter Stuff:

NEW High Fidelity Cathode Modulation of a 250TH RF Amplifier
OTL Class-A Plate Modulator with exceptional regulation
Schematic for a grounded-grid 4-1000A RF Amplifier

General schematics:

HiFi and other Vacuum Tube circuits designed by Mr. Julian M. Sienkiewicz
Guitar Related Circuits
Easy battery charger schematic
Schematic for the AN/PIQ-5 military public address bullhorn

Tesla Coils:

Cheap Tesla Coil
500,000 Volt Tesla Coil (18" sparks)
TUBE-type Oscillator-Driven Tesla Coil

Directed Energy Weapon:

The Hootennanny MK II

No-Cost schematic drawing:

GIF contains popular electronics symbols (cut and paste!)