I'm working on building the Pulse Width Modulator (PWM) generator which is required to control an Electronic Speed Controller (ESC) which controls a brushless DC motor. I'm learning a lot and wanted to share it with everyone. If you're trying to make your own spindle based on the 890KV OX RC spindle then this is for you. I'm working on the parts list and so far I needed a 555 timer and I found some 15 year old timers in my storage. I wanted to test them to see if they are good and here is a circuit which works to test these timers: Now on to using the <good> timer to generate a signal for the ESC. If you have a good timer the lights will alternately blink. They stay on for about 1s each and then turn off and the other one comes on. Anything else means a bad timer or miswired circuit. Also, smoke coming from an LED means a miswired circuit too .