Hi, I will like to announce that we cancelled forum.electroschematics.com and launched basic electronics forum, a place for electronic hobbyist, students and teachers. If you had registered an account, please register again.

With this forum we hope to learn electronics basics, starting from beginning with theory and continue up to electronic projects.

You may use this wireless light switch instead of physical contact with switches which may be dangerous if there is any shorting.
The wireless light switch circuit described here requires no physical contact for operating the appliance. You just need to move your hand between the infrared LED (IR LED1) and the phototransistor (T1). The infrared rays transmitted by IR LED1 is detected by the phototransistor to activate the hidden lock, flush system, hand dryer or else.

This is an electronic muscle stimulator circuit that stimulates nerves of that part of your body where electrodes are attached. It is useful to relieve headache and muscle pain and revive frozen muscles that impair movement. It’s mainly electronic muscle stimulation aid is removing cellulitis and build up you muscles.

This fan controller is using an electronic thermostat LM56 produced by National Semiconductor.
The LM56 is a precision low power thermostat. Two stable temperature trip points (VT1 and VT2) are generated by dividing down the LM56 1.250V bandgap voltage reference using 3 external resistors. The LM56 has two digital outputs.