This electronic roulette circuit with 10 numbers was found in a Popular Electronics from the 80s. The circuit uses indicator LEDs and the transistors are general purpose.
This low-pass filter with 741 op and symmetrical source was found in the August 1993 issue of...
In the figure we show another configuration for a crystal-controlled overtone oscillator using a...
This Linear Technology circuit can measure currents from 100 pA to 100 uA. The circuit is from the...