220 mW Amplifier (CB20054E)

The output transistors can be BC548 and BC558. The circuit is from a 1975 documentation showing a frequency response from 90 Hz to 12.5 kHz.

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LED Display for ASCII Code (CB13762E)
This circuit was found in a 1977 documentation. With it we have the direct indication, through LEDs...
Logic Probe (CB21688E)
In the figure we have the CMOS logic test circuit developed with the 4049. The circuit activates three...
Car Headlight Reminder (CB24039E)
This headlight reminder for your car was found in the May 1970 issue of Radio Electronics...