High Temperature fire Alarm Circuit using transistors
This is high temperature fire alarm circuit, when the temperature rise exceeds the limit, it will sound the siren rang out. It is easy to use with transistor circuit to detects heat. Then, a loud noise of the sirens with IC packages. How it works We uses the combination between …
FM transmitter circuit without coil
This is FM transmitter circuit without Coil,using inverter digital IC as main and controlled frequency is precise by crystal. Figure 1 the circuit diagram In Figure 1 is RF oscillator circuit which use a inverter IC1/2 and ceramic crystal filter 10.7 MHz to use drive IC1/4 – IC1/6 by through …
Modem wireless router overheating troubleshooting
This is Modem wireless router overheating troubleshooting by my son. If your Internet is very slow in the daytime is The modem wireless router is overheat. My son measure its temperature was about 55 degrees Celsius. As Figure 1 So we figured out a way to reduce the heat to …
Simple 12V 2A DC power supply
Today, my son builds a simple 12V 2A DC power supply for a 12V solar pump. It is an Unregulated power supply because load is DC motor only. Note: More circuits 12V Power Supply How to works I teach son to understand the working principle of this projects. The main …