12v regulated inverter supply
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Simple regulated power supply with overcurrent trip
The 15V zener is fed via the 4.7k resistor from the input. With 0.6V across the base-emitter of the PNP transistor, this establishes a voltage of 14.4V across the 3.3k resistor, so there must be a current of nearly 4.4mA...
Alarm Power Supply
This Power Supply is suitable for the Modular Burglar Alarm. However, it has other applications. It is designed to provide an output of 12-volts, with a current of up to 1-amp. In the event of mains failure, the back-up battery...
12V Time Delay Relay Circuit
Protect your equipment with this compact 12V time delay relay circuit. The SMPS-based power supply of modern electronic devices is susceptible to voltage spikes.
This 12V time delay relay circuit is designed to safeguard sensitive electronic devices by providing a delay...
Variable Voltage and Current Power Supply circuit
An alternative approach to utilizing operational amplifiers (op-amps) for power supply regulation is presented. This method necessitates an additional winding on the power transformer to provide the op-amps with a bipolar voltage of +/- 8 volts. The negative voltage generated...
12V Portable and Mobile Power Supply
A 12V portable and mobile power supply circuit design that can be constructed at a low cost and requires minimal circuitry. This circuit provides an output current of 1 amp, which is well stabilized and smoothed.
The 12V portable power supply...
100W Inverter Circuit 12VDC to 220VAC
The schematic diagram of a 100W inverter circuit converts a 12V DC input into a 220V AC output. The circuit is built using the IC CD4047 to generate a 50Hz sine wave signal. The power transistor 2N3055 amplifies the signal...
12vdc mobile battery charger
V1 creates a square wave oscillator, while D1 and D2 couple this square wave to a 12-V battery, raising the voltage to over 20 VDC. If this elevated voltage is not required, S1 can remain open. Q1 functions as a...
-15 V 1-A Regulated Power Supply
The supply receives -20 V from the rectifier/filter which is fed to the collector of the Darlington pnp pass transistor, a TIP105. The base drive to the TIP105 is supplied through resistor R5. The base of the TIP is driven...
Industrial fuel oil furnace controller circuit diagram 2
The industrial fuel oil furnace controller circuit consists of a power supply circuit, a testing and ignition control circuit, and a control implementation circuit, as illustrated in the accompanying diagram. The power supply circuit includes a step-down capacitor (C6), a...