Coaxial Cable Driver (CB20923E)

This National Semiconductor circuit uses an operational amplifier that is uncommon today. The power supply must be symmetrical.

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12 V x 200 mA power supply (CB8497E)
This small regulated power supply was found in a 1963 General Electric documentation. The special...
TTL Counter (CB24288E)
This is a typical 3 ½ digit TTL counter. We found it in the September 1973 issue of Radio...
Amplifier stage (CB21693E)
In the figure we have a simple amplifier stage for BC547 series transistors. The gain is...