Blown Fuse Alarm (CB6109E)

We found this circuit in a 1967 Electronic design. However, it can be easily implemented even today as it uses only common diodes.

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VHF Modulator (CB13496E)
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Being able to operate with frequencies up to 100 kHz, this circuit was found in a 90’s...
FM Telephone Transmitter (CB18206E)
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