Radio and communication circuits - part 1

1. MW reflex radio.

MW reflex radio circuit diagram

Read about this reflex radio circuit

2. FM radio with Phase-locked loop.

FM radio with Phase-locked loop circuit diagram

3. Regenerative receiver.

Regenerative receiver circuit diagram

4. Regenerative detector.

Regenerative detector circuit diagram

5. SW AM regenerative radio with automatic regeneration control.
Read about this circuit here.

SW regenerator with auto setup circuit schematic

6. FM radio with Phase-locked loop.

FM radio with Phase-locked loop circuit schematic

7. FM regenerative radio with low voltage power supply.

FM regenerative radio circuit schematic

8. Circuit diagram of spark-gap CW transmitter from "Aurora" cruiser.

CW transmitter from Aurora cruiser circuit diagram

9. DSB modulator based on varicaps.

DSB modulator based on varicaps circuit diagram

10. FM regenerative radio circuit schematic.

FM regenerative radio circuit schematic

11. FM regenerative radio with AM suppression.

FM regenerative radio with AM suppression

12. Regenerative receiver with automatic regeneration control.

Regenerator with auto setup circuit schematic

Regenerative receiver with auto setup circuit schematic

13. MW receiver circuit diagram.

MW receiver circuit diagram

14. Super regenerative receiver.

Superregenerative receiver circuit diagram

15. SW regenerative receiver.

SW regenerator circuit schematic

16. PLL circuit.

PLL

17. Balanced mixer.

Balanced mixer circuit diagram

18. Frequency syntezator with 1 mHz step.

Frequency syntezator with 1 mHz step circuit diagram

19. Frequency doubler.

Frequency doubler circuit schematic

20. Attenuator based on the bridge circuit.

Attenuator based on bridge circuit schematic

21. Balanced mixer.

Balanced mixer circuit diagram

22. Phase modulator circuit.

Phase modulator circuit diagram

23. Microtransceiver.

Microtransceiver circuit schematic

24. Phase modulator based on 7400 and 7474 IC's.

Phase modulator circuit schematic

25. VHF regenerative radio.

VHF regenerative radio circuit diagram

26. SW regenerative radio.

SW regenerative radio circuit diagram

27. SW regenerative radio.

SW regenerative radio circuit schematic

28. Mixer with wide dynamic range (132dB).

Mixer with wide dynamic range circuit diagram

29. SW regenerative radio based on opto-isolator circuit.

SW regenerative radio based on opto-isolator circuit diagram

30. Simple regenerative radio.

Simple regenerative radio circuit schematic

31. RX audio transmitter circuit diagram (radiomicrophone).

RX audio transmitter circuit diagram

32. VHF regenerative radio.

VHF regenerative radio circuit schematic

33. MW radio based on op-amps.

MW radio based on opamps circuit schematic

34.Balanced mixer .

Balanced mixer circuit schematic

35. Active magnetic loop antenna.

Active magnetic loop antenna circuit diagram

36. Sensitive AM demodulator.

Sensitive AM demodulator circuit schematic

37. AM/FM regenerative receiver.

AM/FM regenerative receiver circuit diagram

38. VHF regenerative radio.

VHF regenerative radio circuit schematic

39. FM demodulator based on logic gates (7400).

FM demodulator based on logic gates circuit diagram

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