Beta Meter (CB3804E)

This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be done based on transistors with known gains.

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Li Ion Charger (CB5411E)
This charger makes use of the LTC4026. We found it in a 2005 Linear Technology publication. The circuit...
Microsecond CMOS Timer Up To Hours (CB1268E)
This circuit uses a 4020 counter that divides the frequency up to 210, being found in a former...
Debounced switch (CB6815E)
This version of the traditional debounce circuit was found in a 1964 documentation. The circuit...