This timing circuit was found in old documentation. The technology is CMOS. The supply can be made with voltages from 3 to 12 V. The time depends on R1 and C1.
Found in American documentation this circuit has a typical gain of 500 times. Other transistors can...
This regulator type series for charging batteries from solar panels was found in a technical...
This transmitter can send its signals from several kilometers away, depending only on the antenna...