This somewhat complex circuit was found in the May 1984 issue of Radio Electronics magazine. The circuit drives a power stage with a triac for loads connected to the power grid.
This small general purpose and RF transistor tester appeared in a February 1958 Radio Electronics...
The MC4741 integrated circuit consists of four operational amplifiers similar to the 741 in a...
We found this touch control on a Popular Electronics from 1970. The circuit makes use of an...