This circuit for battery powered laser diodes was found in a 1992 RE Experimenters Handbook. The circuit uses common components today.
Found in a Popular Electronics from the 1990s, this circuit uses components from National...
This circuit was found in Motorola documentation from 1968. SCRs can be modern equivalents and the...
Suggested by the 90s ARRL Handbook edition, this circuit aims to reduce or cancel noise at the...