Capacitance Meter

This Capacitance Meter project is more complex than the others described earlier. However, when finished, you will have an instrument capable of measuring all but the largest capacitors used in radio circuits. Unlike variable resistors, most variable capacitors are not marked with their values. As well, the markings of capacitors from salvaged equipment often rub off. By being able to measure these unmarked components, this project will prove useful to the constructor, vintage radio enthusiast or antenna experimenter.

Transistorized Dip Meter

This dip meters use 2SC2369 transistor for RF Oscillator and 2SC458 for AM Tone Oscillator. VR 10 K potentiometer is a linear type it adjust the working voltage of the RF oscillator part from 0~9 Volt DC, it influence the meter reading sensitivity and in the instance the RF power. This Dip meter is a multi-function; it can also be used as a field strength meter and or AM transmission monitor when a headphone replaces the meter. Beside it can be used as a RF signal generator for receiver tuning purpose.

RF Wave Absortion Meter for 1 to 950 MHz

This RF Wave Absorbion meter will detect signals between 10cms and 10m away all acording to the setting of the 22MegOhm gain adjustment potentialometer and the power of the transmitter. The RF signal is detected across the germamium OA91 doides and rectified to a d.c. level driving a 10LED driver IC. The LED's are marked 1 to 10 indicating the strength of the detected RF signal.