Transformerless Wideband Switch (CB6457E)

We found this chopper circuit in a 1967 publication. The transistors are of the time, and current equivalents can be used.

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Function Generator 8038 (CB17190E)
This circuit appears elsewhere on this site. Although the 8038 is not an easily obtainable...
150 mA LDO with the T`S12963 from Texas Instruments (CB12963E)
The Texas Instruments TPS80 LDO (Low Dropout) series (www.ti.com) can provide fixed or adjustable output...
AC DC indicator (CB7011E)
Found in Radio Electronics, this simple indicator circuit uses general-purpose transistors common today....