We found this circuit in a Philips documentation from 1965. The circuit uses a common LDR sensor and the transistors are general purpose types. TR2 can be a BD135.
Connected between an external antenna and the antenna input of a receiver, this circuit provides...
This an old commercial receiver found in a year 1958 magazine. The circuit uses some transformer...
This micro FM transmitter uses a tunnel diode as an oscillator. I found it in an English...