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 |

13.8 V x 5 A Power Supply (CB1216E)
This source was found in a 1982 American publication, but can be easily assembled using 2N2995 (PNP...
REF6000 Precision High Voltage Reference (COM094E)
September 2016 - It can be purchased at Mouser Electronics the new REF6000 precision voltage...
Simple signal generator (CB22169E)
This circuit uses the well-known 8038 to generate 3 waveform signals. Frequency bands are selected by...