Reminder (CB9548E)

This circuit maintains on a flashing LED at a frequency determined by the capacitor. The unijunction transistor can be 2N2646.

| Clique na imagem para ampliar |

Noise generator (CB8009E)
This circuit generates noise pulses for audio equipment probes. The circuit is from a 90’s 303...
Visible light transmitter (CB7852E)
This modulated light transmitter was found in a 90s Popular Electronics. In place of the lamp with...
Superheteredyne MW Receiver (CB962E)
This circuit, found in a 1958 magazine, is for reference only, since the components are not easy...