4 to 55 MHz amplifier (CB9166E)

This broadband amplifier was found in an Elektor from the 90's. The gain is 10 dB with a noise figure of less than 5 dB.

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Tone Oscillator (CB22066E)
Found in old documentation, this oscillator with the LM380 produces an audio tone in a speaker....
Triangular Signal Generator (CB19523E)
The integrated circuit used in this configuration is uncommon today. The diodes are for general use...
Signal Injector (CB5030E)
This circuit was found in a Radio Escuela Gráfica magazine from Argentina published in the 70's....