This battery-powered micropower supply was shown in Radio Electronics magazine in 1991. The maximum current is 170 mA. and the integrated circuit is the MAX655 from Maxim.
Found in a Popular Electronics from the 90s, this game can be seen in other configurations on this site. The...
With a 1 500 uFcapacitor this timer can reach times up to one hour. The capacitor must be of good...
This circuit appears in other articles in this section, but it is very interesting. It is a...