Found in an Electronic Design from the 90's, this circuit supplies voltages according to the indicated component values. The integrated circuit is from the time.
Found in Motorola documentation from the 1980s, this circuit employs an integrated device from...
Found in the American 73 magazine for radio amateurs, this circuit can test common quartz...
This simple 1-transistor MW radio for listening on the phone was found in a Japanese magazine in...