Decade neon counter (CB6618E)

Found in a 1969 documentation, this neon lamp circuit may have the number of steps increased. The power supply is made with high voltage.

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Selective tone decoder (CB3957E)
This high selectivity circuit for single tone decoding was found in 1970s documentation. The coil...
Operational with current booster (CB25182E)
The figure shows how to obtain a higher output current for an operational amplifier. With the...
Amplifier with the TAA370 (CB6277E)
This amplifier for hearing aid was found in a 1968 documentation using an integrated of the time....