Sine to square converter (CB7330E)

Obtained in a Popular Electronics from the 90s, this circuit converts sinusoidal signals up to a few megahertz into rectangular signals.

Indicator for windscreen wiper (CB6038E)
This sophisticated circuit is from old Motorola documentation, using common integrated devices...
9 V Battery Eliminator (CB1154E )
This ultra-simple 9 V power source was obtained in an Argentine publication of the 1970s, but it...
Microsemi Le87536 Dual Differential Amplifier
Microsemi Le87536 Dual Differential Amplifier Microsemi / Microchip is making available through Mouser...