This circuit was found in a documentation of the 80s, having didactic purpose. For R1 values between 10k to 1M can be used. Transistors are general purpose types.
This motor control using transistors was found in a recent English publication. The circuit is for...
If we modulate a beam of light from an LED, for example, we can receive this beam of light at a...
This constant current charger from 1997 Linear Technology Applications uses common components at...