Found in documentation from 1924, this receiver has several sets of coils. Power is supplied by several batteries and listening on high-impedance headphones.
This circuit of a few tens of milliwatts of power requires a single source. We found it in a Radio...
This circuit has two stable states such that at each instant only one SCR leads. The state change is...
An stable multivibrator with 50% of duty cucle can be mounted using the 555 as shown by the...