This super regenerative detector circuit was found in an English documentation from 1963. The coil is frequency compliant. The transistors are germanium of the time.
A version of a monostable that uses the 4528, but is triggered by negative transitions of the...
We find this filter with three operational of the time in an American documentation of the 80s....
This sensitive AM radio doesn’t need external antenna, picking easily local stations. The output...