This window comparator circuit was found in a Popular Electronics from the 90s. The circuit has a multiple adjustment input network to determine the operating ranges.
The component values depend on the current, which in this case has a maximum value of 5 A. The...
This effect for guitar was found in an English magazine from 1978. The transistors can be the most...
I found this circuit in a 1986 English magazine. It can still be easily assembled, exchanging Q1...