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. …
This is 5V switching regulator circuit using transistor, decreases voltage or Step down voltage converter circuit, decrease 6-18V into 5V at current 100mA.
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. …
This again the one circuit that can is dc regulator the many voltage get simplely. Or Simple step down dc converter multi voltage. By have R1 be formed fix the size of current, when Q1 2N3904 work by voltage output equal to volt at a pin B of Q1 2N3904. When compare with ground. Which volt be under zener diode the connection and a pin B of Q1. It can fix dc voltage many the level Vout : 3V that sizes have from VZD1, Vout = 6V Volt , fall straddle ZD1+ZD2, Vout 9V volt fall straddle ZD1+ZD2+ZD3, Vout 12V …
From originally at we use light ordinary bulb gives the light but get into trouble about useful short life and about using electric energy very. In contain divide us can use LED at have many brightnesses specially pay back a light bulb well. Today I then beg for to introduce type circuit that applies to Led lighting circuit. 18 LED dimmable LED lamp by LM2941C This circuit is a dimmable white LED lamp array with 18 LEDs. The lamp brightness is regulated as long as the input voltage is above 10.5V. … Solar garden LED light and single NiCd AA …