Oscillator for the medium wave range (CB21140E)

This ground-based circuit was found in 1990s American documentation. The transistor can be any general-purpose equivalent.

| Clique na imagem para ampliar |

Sampling and holding (CB9188E)
Using components from the era, this 90's EDN circuit is used in analog to digital conversion...
Car adapter (CB7252E)
Found in an American publication from the 90s, this circuit allows the supply of 3, 6 and 9 V...
Light Controlled Monostable (CB21018E)
We found this circuit in an old Popular Electronics. The circuit is experimental, driving an LED...