JAM(Just A Minute) Circuit

This jam circuit can be used in quiz contests wherein any par- ticipant who presses his button (switch) before the other contestants, gets the first chance to answer a question. The circuit given here permits up to eight contestants with Continue reading

Pulse-Generator & Signal-Tracer

Dual-purpose test-instrument Very simple circuitry, 1.5V Battery-operated Parts: R1__________________1M 1/4W Resistor R2,R4_______________2K7 1/4W Resistors R3________________150K 1/4W ResistorC1__________________2n2 630V Ceramic or Polyester Capacitor (See Notes) C2,C3_______________4n7 63V Ceramic or Polyester CapacitorsD1_______________1N4148 75V 150mA DiodeQ1________________BC547 45V 100mA NPN Transistor Q2________________BC557 45V 100mA Continue reading

Casio data logger

AWARD – This design has been judged the "best overall" at the Circuit Cellar Ink "Design 98" Contest sponsored by Microchip and Hewlett Packard. Alberto Ricci Bitti PIC based Casio Data Logger design Bring the REAL world inside the Casio! Continue reading

The Relay Sub Board

Attach this board to the Simplified I/O Interface Board Use nine pieces of hookup wire (or a piece of ribbon cable) to connect corresponding points on the I/O Demonstration Board to the Relay Sub Board. Connect 12 volts DC (smoothed) Continue reading

The 8Way Relay Board

This board is designed specifically to control the 5-motor Robot Arm sold by Baycom Technologies. It has no input facilities, but it is less expensive than combining the I/O Board with the Relay sub-Board. If you need lots of relays Continue reading