This circuit was obtained from an American documentation from the 1970s. Information on the current obtained and the winding of the transformer is not given.
We found this simple receiver with germanium transistors and listening on a crystal phone in a...
For the 1 MHz frequency, the pass band of this filter is only 120 Hz wide. The filter is suitable for...
Current drain with a 6 V supply is only 6 µA. Frequency is given by the capacitors, and output...