This high-sensitivity circuit was found in a 1980s documentation. The source can be a 9 V battery with a splitter to make it symmetrical. The shock can be 200 uH or more.
Found in a 1980s documentation, this circuit makes use of components from that time. Modern...
Suggested by an old Popular Electronics, this circuit is based on an uncommon integrated today,...
For counting to values higher than 16, many 4520 can be cascaded as shown in Figure . The EN...