Boost up voltage for The Relay using 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. …
Simple 6V to 12V boost converter circuit using BD679 transistors
DC converters
This circuit is power supply circuit, as Simple 6V to 12V boost converter circuit using BD679 transistors, that if we want dc voltage 12V but , we have 6 volt only the circuit can modify DC voltage 6 Volt be 12VDC. The principle works of the circuit is Q1, Q2, R1, R2, R3, R4, R5, D1, C1 and C2 build the circuit is model astable multi vibrator give output be Square Wave. Which be positive pulse signal at have many frequency. And have R6 perform be limit current already flow come to reach at a pin B of Q3 and …
5V to isolated 5V at 20mA converter using MAX635
Power supply
      When we need a constant voltage 5V at the current about 20mA, by there are power supply source voltage about 4V to 6V. In this circuit, We use the MAX635 IC number is the main equipment, that acts as Preset/Adjustable Output CMOS Inverting Switching Regulators. At pin A, a negative output dc-dc converter generates a -5V. First, a negative output voltage dc-dc converter generates a -5V output at pin A.       Then, the primary of the transformer (T1) must fly back to a diode drop more negative than -5V. If T1 has a tightly coupled 1:1 turns ratio (270uH), there will …
12V to 9V 2A step down dc converter using IC 741 and 2N3055
Power supply
This circuit designs for modify power supply input 12V from battery or the other. Have the level voltage be down be left 9V be stable or , 9V at 2 Amp DC power supply . By this circuit gives usual equipment , seek easy. Be integrated circuit IC 741 and power transistor 2N3055. Besides this circuit still can fine to differ out voltage with well and have picture stability although load modify. The zener diode 8.2V be formed fix stable reference or voltage the referable at pin3 of the integrated circuit and the VR1 for give fine the level volt …