This modulator circuit for low intensity signals is from old documentation. The integrated circuit used is uncommon today. The circuit operates with signals up to 2MHz.
This simple AM transmitter for very small ranges uses in the original version of the 1970s, a...
This circuit was obtained in a 1976 English magazine, and can be assembled with equivalent...
This circuit is from a 2001 publication. The balun transformers are of the commercial type for TV...