Found in Popular Electronics from the 90s, this circuit detects modulated infrared radiation and serves as a test for remote controls. Infrared sensors equivalent to the one indicated can be used.
This sophisticated circuit is from old Motorola documentation, using common integrated devices...
This ultra-simple 9 V power source was obtained in an Argentine publication of the 1970s, but it...
Microsemi Le87536 Dual Differential Amplifier Microsemi / Microchip is making available through Mouser...