Operational current source (CB8856E)

We found this circuit in a 70s EDN. The circuit makes use of operational of the time.

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Sound Pulser (CB13157E)
We found this circuit in a publication from the 1970s. It produces intermittent clicks on a...
Noise and rumble filter (CB6716E)
We found this circuit in a Philips documentation from 1969. It makes use of transistors of the...
MW Mechanical Radio (CB10650E)
This circuit was found in a 1999 English magazine, but can be easily assembled with BC548...