4-tube reflex (T1662E)

This circuit that uses a loop antenna was found in a 1924 publication. The circuit has several supply voltages and sets of audio and RF coils.

| Clique na imagem para ampliar |

300 Hz to 25 kHz TTL Oscillator (CB15626E)
The circuit presented consists precisely of an oscillator (multivibrator) that takes advantage of the 4...
General Purpose Alarm (CB12621E)
The critical components of this project from a 1978 publication are the transformers, which can be...
RF switch using diodes (CB9225E)
This circuit can switch signals in the 3.5 to 30 MHz band. We found it in a QST magazine from the...