Measurement

1. Inductance meter circuit.

Coil inductance meter circuit diagram

2. Inductance meter based on 7000 logic gates.

Coil inductance meter circuit schematic

3. Capacitance meter with one-shot 74121.

Capacitance meter circuit schematic

4. Inductance meter circuit as add-on for frequency counter.

Coil inductance meter circuit diagram

5. Capacitance meter based on 7400 logic gates.

Capacitance meter circuit diagram

6. Capacitance meter uses 7400 logic gates and 3x7490 binary counters.

Capacitance meter circuit diagram

7. Inductance / capacitance meter .

Inductance meter circuit diagram

8. Antenna current meter.

Antenna current meter circuit diagram

9. Sensitive millivoltmeter.

Sensitive millivoltmeter circuit diagram

10. L, C meter based on IC 4000 series.

LC meter circuit schematic

11. L, C meter based on IC 7400 series.

LC meter circuit diagram

12. HF rectifier voltmeter.

RF voltmeter circuit diagram

13. Capacitance meter based on 7400 logic gates.

Capacitance meter circuit diagram

14. AC voltmeter with linear scale.

Linear AC voltmeter circuit diagram

15. X-ray - photometer.

It uses cadmium-sulfide photoresistor as X-ray sensor.

X-ray - photometer circuit diagram

16. Nonlinear double T-shaped bridge.

Nonlinear double T-shaped bridge circuit diagram

17. AC voltmeter with linear scale.

AC voltmeter with linear scale circuit diagram

18. How to measure impedance of antenna.

1. Set the signal-generator to measurement frequency, and set the switch S to the "1" position.
2. Set the antenna for the same frequency by the variable inductance L until the ammeter A displays the maximum current Im.
3. Then set the switch to the "2" position, and with the variable capacitor C get the maximum value of the ammeter A.
4. Now adjust the potentiometer R until the ammeter A displays the maximum current Im again.

Value of R in this position is equal to the impedance of antenna Rr at the measurement frequency. Radiated power of antenna is:
Pr = Im2 x Rr

How to measure impedance of antenna

19. Add-on for frequency counter for inductance measurement.

Additional for voltmeter to measure inductance circuit diagram

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