Timer set for 30 minutes by transistor
Basic Circuits
This circuit is based on learning of the discharge and charge of the C, which can be used as a timer circuit and can be applied in the off electrical appliances. The application has also put relay instead of LED can be enabled. This circuit is working as video below: When you click the switch S1 will cause LED1 light told state ready to run S2 is a timer switch. On press switch S2 current will flow to the C1 charge fully. Then to discharge out through R2 to limit current flow to the bias for transistor Q1. Q1 and …
Simple speaker overload protection circuit
Controls & Timers
This is simple speaker overload protection circuit. Generally the level of a signal that departs output of sound signal generator the all. The that get fix have standard same score be 1Vrms. But in now audio signal generator the all the that may produce come to exceed limitation standard of the level input of stereo power amplifier. Thus, This is simple speaker overload protection circuit., for protect a part amplifier and a loudspeaker are damaged. From circuit that picture when have input voltage resistor R1 perform current limit preceding still diode D1-D4 , build model Full wave rectifier circuit, for …
Boost up voltage for relay by BC558
DC converters
Using relay general the majority then to use power supply that have DC Voltage with the value volt that specify on relay. For relay work but , if , we have no power supply that want to feed give relay. This circuit helps to give relay can work. From the circuit uses two power supply from at for come to work give Relay 12V work. The power supply first use 6Volt when feed volt come in touch C1 charge take keep. The power supply that 2 use voltage more than 3V feed come in the way input make Q1 work. …
Fan Speed over Ride Switch
Controls & Timers
If you get into trouble about the heat of notebook. Today I begs for to advise the way enhances the speed of the electric fan with Fan Speed over Ride Switch circuit. Normally the electric fan will begin to turn when 60 c temperatures by have voltage feed 2.0 v. If still hot again enhance voltage go to 2.1,2.2,2.3….3.0V. At 80c circuit temperatures board circuit send the maximum score only. But temperature still go up again arrive at 100c until shutdown by oneself finally. When try wire for electricity usb 5V as a result make the electric fan turns well. …
PWM Speed Rotation Forard-Reverse and Regenerative Braking
Mini Projects
This is PWM Speed DC motor Rotation circuit. It can Forard-Reverse and Regenerative Braking function. By this circuit use a signal PWM control the speed of DC 12V motor with Power mosfet IRF150. The relay RY1 use control Reverse with the digital alarm , change , Q10. The Relay RY2 work be , function brake resistor. By control Run or stop with the digital alarm with . The F1 , use protect through the circuit. The D1 use for protect current turn back from DC Motor. The detail is other , please see in the circuit. Note : PWM Control …