Based on CMOS logic gates, this circuit was found in an Electronic Design from the 90s. The circuit is for voltages from 11 to 15V, but it can be changed,
T1 and T2 can be BC557 and T3 a TIP32 for lamps up to 3 A. The supply is made by voltage of 12 V...
This fourth-order filter was found in American documentation from the 90s. The circuit applies to...
This resistance meter uses a two-transistor oscillator as basic configuration. The tone produced...