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5V 0.5A power supply – Circuit Schematic
5V 0.5A power supply
The circuit is essentially a constant source modified by the feedback components R2 and R3 to give a constant voltage output. The output of the ZN424E need only...
Half wave AC phase-controlled circuit – Circuit Schematic
Half wave AC phase-controlled circuit
The 5AH will trigger when the voltage across the two 0 juF capacitors reaches the breakdown voltage of the lamp. Control can be obtained full off to 95% of the ...
Half-wave rectifier – Circuit Schematic
Half-wave rectifier
This circuit provides for accurate half wave rectification of the incoming signal. For positive signals, the gain is 0; for negative signals, the gain is �...
Current source – Circuit Schematic
Current source
This precision current source has 10 µA to 10 mA ranges with output compliance of 30 V to -5V. Output current is fully adjustable on each range with a calibr...
Half-wave rectifier – Circuit Schematic
Half-wave rectifier
The circuit provides for accurate half-wave rectification of the incoming signal. For positive signals, the gain is 0; for negative signals, the gain is -1. By ...
full-wave rectifier – Circuit Schematic
full-wave rectifier
When equality of two equations shown in satisfied, full-wave output of circuit is symmetrical. ...
Power supply protection circuit – Circuit Schematic
Power supply protection circuit
When using a regulated supply to reduce a supply voltage there is always the danger of component failure in the supply and consequent damage to the equipment. A...
Overvoltage protection circuit – Circuit Schematic
Overvoltage protection circuit
The silicon controlled rectifier (SCR) is rated to handle at least the current of the power supply. It is connected in parallel across the 12 V dc output lines,...
Microprocessor power supply watchdog – Circuit Schematic
Microprocessor power supply watchdog
The circuit monitors the input to the microprocessor 5 V regulated supply for voltage drops and initiates a reset sequence before supply regulation is lost. In ...
Power supply monitor – Circuit Schematic
Power supply monitor
This circuit uses a tricolor LED display to indicate acceptable and unacceptable output voltages. One to set the upper voltage limit, the other, the lower volta...
High voltage supply – Circuit Schematic
High voltage supply
A 6 V battery can provide 100-150 Vdc center-tapped at a high internal impedance (not dangerous though it can inflict an unpleasant jolt). A 6.3 V transformer i...
High voltage geiger counter supply – Circuit Schematic
High voltage geiger counter supply
This circuit will generate about 300 volts dc—at a very low current, but enough for a GM tube. ...
Simple high-volt supply – Circuit Schematic
Simple high-volt supply
A light dimmer, a 1 µf capacitor and a 12 V car ignition coil form the simple line powered HV generator. The current in the dimmer is shown in Fig. B. At tim...
Ultra high voltage generator – Circuit Schematic
Ultra high voltage generator
By repetitively charging and discharging a capacitor through the primary of an induction coil with a high voltage, an ultra high emf is induced in the secondary...
Memory save on power-down – Circuit Schematic
Memory save on power-down
The auxiliary output powers the memory, while the main output powers the system and is connected to the memory store pin. When power goes down, the main output ...
Increasing the power rating of zener diodes – Circuit Schematic
Increasing the power rating of zener diodes
A power transistor can be used to provide a high powered zener voltage from a low wattage zener. A 400 mW zener can be used where a 10 watt zener is required or...
Preregulator for power supply – Circuit Schematic
Preregulator for power supply
This SCR pre-regulator keeps the filter capacitor Vc, in a variable output power supply, a few volts above the output voltage V0. The benefits include: less hea...
Off-line flyback regulator – Circuit Schematic
Off-line flyback regulator
This circuit uses a low-cost feedback scheme in which the dc voltage developed from the primary-side control winding is sensed by the UC1842 error amplifier. Lo...
Stand-by power for non-volatile cmos rams – Circuit Schematic
Stand-by power for non-volatile cmos rams
To prevent loss of data when a CMOS RAM is switched from normal operation (Vcc = 5 volts) to stand-by mode (Vcc = VBAT) it must be ensured that the CS pin goes ...
Power supply for 25-watt arc lamp – Circuit Schematic
Power supply for 25-watt arc lamp
A dual-voltage circuitry both strikes and maintains the arc. The lamps require a starting voltage in excess of 1,000 volts. Once stabilized, the voltage drop ac...