This an old commercial receiver found in a year 1958 magazine. The circuit uses some transformer available that timer and the transistors are germanium types. The circuit is intended to receive MW stations.
The current of this source is 200 mA at the most, and the output depends on the zener that may...
This peak detector has a memory to prolong the response. The circuit is from American...
The circuit in the figure uses the four current amplifiers of the LM3900 to generate a sawtooth signal...