High Frequency Switch (CB6007E)

This 80's circuit can be implemented with modern equivalent FETs with lower on resistance. The attenuation is 80 dB at 100MHz.

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50 to 150 MHz oscillator (CB9629E)
This overtone oscillator can generate signals up to 150 MHz. The crystal determines the frequency and...
Ultrasound Emitter (MSB122E)
The circuit shown by the figure below can produce signals in the range between 20 kHz and 30 kHz....
Audio IR Link (CIR811E)
This circuit is used to convert audio signals from na amplifier into infrared modulated signals....