Institute Newton C. Braga

Circuit Bench

LED animation (CB22469E)
Found in a Popular Electronics from 1992, this circuit was created to give effects to an...
Black light (CB7898E)
This circuit was found in a PE Hobbyst Handbook of 1989. It uses a black light fluorescent of the time....
Drive Loads Up to 300 mA LM3900 (CB14222E)
The figure shows how to drive a load up to 300 mA with an LM3900. The transistor can be a BD136. We...