Hearing aid amplifier (T1580E)

This circuit is from a 1947 Radio Electronics. The 4-tube circuit is battery powered and uses a crystal phone.

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Dual temperature monitor (CB21377E)
This circuit was obtained from a 1967 GE SCR manual. It is intended for controlling relays...
Microchip EQCO62X20 6.25Gbps Asymmetric Coax Equalizer
Microchip's EQCO62X20 6.25Gbps Asymmetric Coax Equalizer is a driver/equalizer chipset that forms...
Synchronized Triac Control (CB25497E)
This circuit was found in the August 1992 issue of Radio Electronics magazine. The circuit can be...