Ksimus is a circuit simulator that allows you to build digital and analog circuits with discrete components and simulate them in real time. Ksimus does have its limitations though.

This one comes to us by way of [Astronomermike], who chose to make a digital circuit with nothing but 555s and a largish handful of passives as his entry in the current 555 Timer Contest.

Thus the 1530 digital counter (translated) was born. [DerSchatten13] started out by building his design on a breadboard. He used every I/O pin on an ATtiny2313 to implement his circuit.

Digital potentiometer circuit diagram The circuit diagram shows a complete digital potentiometer based on a Type X9CMME. It is provided with two controls, S1 and S2, an optical indicator and a delayed ...

Implementing standard UART communication required use of Silego’s GreenPAK analog and digital blocks, with the end result being a Geiger counter that offers real-time radiation measurement. The ...

1. The initial circuit implements ×4 multiplication for inputs up to 40 kHz to enable effective frequency counting despite short frequency-counter gating times.