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

Flasher Circuits

Flasher Circuits Two Transistor Flasher Ideas The basic two-transistor flasher shown below has found its way into dozens of applications due to its simplicity and versatility. Applications have included such diverse circuits as a micropower low battery indicator, a lightning Continue reading

Simple Stand-Alone Voltage-to-Frequency Converter Using LM231-LM331

Using LM231/331 chip, we can build a low-cost voltage-to-frequency converter, ideal for analog-to-digital conversion, frequency-to-voltage conversion, long-term integration, linear frequency modulation-demodulation, and many other functions.  When it’s used as voltage-to-frequency converter, the output will be a pulse train with frequency Continue reading