This circuit was found in a 1977 Radio Handbook. The MOSFET supports an equivalent. Capacitor C must be low leakage.
Lumileds LUXEON Infrared LEDs can be purchased from Mouser Electronics in a wide selection of...
This Harris circuit from the 90's is intended for recording old EPROM memories. The circuit uses...
This circuit is from a manual of linear integrated circuits of the 80s. The operational is of the...