Dual Tuning Reflex Receiver (T1564E)

This circuit was found in a 1924 Gernsback publication. The variable capacitors are dual. Listening is through a high-impedance phone.

| Clique na imagem para ampliar |

imer 555 with Relay (CB15098E)
T This circuit activates a relay at the end of the time delay. The indicated relay is of the low...
LED bargraph with LM3914 (CB11842E)
This is the basic configuration for using a moving bar indicator or bargraph using the LM3914...
Gain 100 operational L161 (CB4909E)
We found this circuit in an old manual. The bypass range is 20 MHz and the power supply must be...