This circuit uses a high brightness LED to simulate a LASER. We found it in a 1991s PE Hobbyst Handbook. The components used are all common.
This circuit was obtained in a magazine Hands-On Electronics of June 1987. It is a circuit that...
The purpose of this circuit found in an old Elektor is to light a lower power lamp when the bigger...
Found in a 90s Popular Electronics, this circuit uses two PLL tone recognizers to trigger by touch an...