A telephone remote ringer
A telephone recording beeper
A telephone FM transmitter
A telephone line analyzer
Two simple electronic sirens
A variable frequency audio oscillator
Building a VOX (voice operated switch)
A nickel-cadmium battery zapper
A multi-purpose digital tester
3 1/2 digit module applications
More 3-1/2 digit module applications
A transistor/diode tester
Quick Tracey, the semiconductor sleuth
Digital voltmeter capacitance adapter
Measuring inductance with "Quick Henry"
