This interesting circuit uses a sodion valve that we have already described in an article on the website. The circuit uses several batteries for power. The phone is of high impedance.
This circuit was found in February 1976, Radio Electronics magazine. The components are from the...
I found this circuit in a 1993 technical documentation. When we press the switch in parallel with...
This circuit provides two outputs of the same signal. One with the original phase and the other...