Timer for enlargers (CB8301E)

From the time when photographs developed on paper could be enlarged, this circuit was found in a 1960s General Electric documentation.

| Clique na imagem para ampliar |

Current Sensor with TSC102, from STMicro (CB25412E)
The TSC102 integrated circuit from ST-Microelectronics consists of a current sensor system that, in...
Variable Zener Diode (CB5875E)
This circuit was found in old documentation, but the transistor may be the modern equivalent BC547....
6 W Audio Amplifier using the LM378 (CB442)
The IC used in this project is not common these days, but if you have one you can build a high...