The 555 feeds its output (amplified by Q1 and Q2) to the input of transformer T1, a reverse-connected filament transformer with the necessary step-up turns ratio. Capacitor C4 and coil L1 filter the input to T1, assuring that it is effectively a sine wave.....

The basic circuit described in this document is capable of generating up to 30 kilovolts or more from a low voltage DC source using the flyback (LOPT) transformer salvaged from a B/W or color TV or computer monitor. Typical output with a 12 VDC 2 A power....

This is a power supply circuit that produce voltage 12 to 24 V. It is very simple, doesn`t need regulator just bridge rectifier, filter capacitor and transformer. A bridge rectifier makes use of four diodes in a bridge arrangement to achieve full-wave....

XP-power plug, FU-fuse, ST-temperature control, T1-low-voltage transformers, S1, S2-door interlock switch, S3-threshold control switch, RT-thermal sensor, K1, K2-relay, EL- furnace light, M1-wheel motor, M2-fan motor, T2-high-voltage transformer, C-high....

..

A simple but effective fixed gain transformerless microphonepreamplifier circuit diagramin the picure below. The circuit amplifies differential signals from low impedance microphones by 50 dB and has an input impedance of 2 kOhms. The OP27/37 operational....

Transformer OCL and capacitor C1 form a tank circuit, to which are coupled sufficient turns to drive the grid in the lower left-hand winding. The output circuit is coupled by a separate winding. For good wave shape in such an oscillator, triodes and class B....

Work of the circuit The circuit consists of power supply circuit, ultrasonic oscillator circuit, pre-amplifier, amplifier and power amplifier drive output circuit. (It is showed in picture 8-125.)Power supply circuit consists of power switch Sl, fuse FU,....

Nowadays the most commonly available headphones have an impedance of 2 G— 32 ©, this relatively low value makes them unsuitable for such a design. However, with a bit of crafty transformation these headphones can be used in just such a design. To adapt them,....

The last section presented a number of basic free-air laser light communications projects. You learned how to modulate a He-Ne laser beam using a transformer, transistor, and even a piece of Mylar foil stretched in a needlepoint hoop. You also learned....

In the first, voltage from AC 220V or 110V entered to the transformer and will be lowered into 12V AC. And then AC voltage will be rectified by 4 diode or you can use bridge diode to the DC voltage. And the DC voltage output will be filtered by Condesator....

Using this circuit you can convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer. The basic formula is P=VI and between input....

1000W Power Inverter circuit diagram: This is the power inverter circuit based MOSFET RFP50N06. The inverter capable to handle loads up to 1000W, it`s depended on your power inverter transformer. The RFP50N06 Fets are rated at 50 Amps and 60 Volts. Heatsink....

The schematic diagram below show a circuit of high voltage generator. This circuit uses a 4049 hex inverter as an oscillator, and you can use ignition transformer from automotive engine. A fly-back transformer is possibly usable too. The 4049 will drive the....

Great idea to remove the core of the HV-transformer, that increases the frequency and the step up rate still seems to be good enough. Do you hear any singing or screeching when your circuit is on I also saw that the spiral type CFLs are specially good for....

This power supply is designed for amateurs, and has been in operation for over 10 years. Its design is very simple and practically immune to RF. It brings together the individual pieces, is the most expensive part of 600VA toroidal transformer, which can be....

The gas furnace is the simplest to operate and understand. Therefore, we will use it here to look at a typicalheating system. This type of natural-gas furnace is used to heat millions of homes in the United States. Note the location of theblower switch and....

To avoid hum and interference in our high quality DAC we need to galvanically isolate him from a signal source and break potential unwanted ground loop. One possibility is to isolate DAC on input of the S/PDIF decoder with pulse transformer or connect him....

I picked up an LM386 Low Voltage Audio Amplifier. A little poking around and I found National Semiconductor`s data sheet, showing a schematicthat requires only 5 components for a gain of 20, and 7 for a gain of 200. Being the skeptical man I am, I built the....

My neighbor`s drill charger stopped working. I found that the primary wires in the transformer were non-functional. This charger had a very simple design. It used a transformer, followed by a diode bridge and a larger resistor. The power supply indicated it....

The heater element (not shown) is connected in series with two back to back 16 amp SCRs (not shown) which are controlled with a small pulse transformer. The pulse transformer has 3 identical windings, two of which are used to supply trigger pulses to the....

Simple rectifier circuit replaces battery in vacuum-tube voltmeter. Provides good regulation and eliminates need for frequent battery replacement. Remove battery before using supply. AC source can be 6. 3-V secondary of filament transformer or terminals of....

Audio from a telephone line can be obtained using a transformer and capacitor to isolate the line from external equipment. A non-polarized capacitor is placed in series with the transformer line connection to prevent DC current from flowing in the....

In this article I will offer driver circuit for 12 V/5Watt fluorescent lamp, this circuit used a normal 220 to 10V stepdown transformer in reverse to step 12V...

The leads from the transformer to the circuit are quite long (>5m). Apparently the 110V side of the transformer was switched off somewhat frequently lately which likely caused a spike on the secondary (24V) side. The input pin of the LTC3631 has a visible....

I usually can`t hear the doorbell when I`m in the basement. This project describes how to add an inexpensive remote doorbell to your existing household doorbell. My doorbell runs off of a 24VAC transformer that is live all the time. Someone presses the....

How hard it would be to convert the relay in this design to a triac It switches a 120v Ni-chrome wire that is 60ohms. Thanks for any help you can offer. Your right i apologize. The ic powers off of a 12v transformer. However there is a 120v neutral and line....

The battery charger pictured here is a real beast. It will dump 60 amps into a 12 volt battery bank that is low, and will taper down to about 10 amps charging current as the batteries fill. Total cost, $20! The basis of this charger is dead 1000 watt....

The back EMF voltage spikes produced by stepper motors (particularly higher voltage motors) can damage your PC`s printer port if connections are made incorrectly, flyback diodes are absent or connected in reverse, etc. The safest options are opto-isolated or....

Here is simple circuit of a simple emergency light that can be constructed without much pain. The components of this circuit are 2 transistors, a transformer, 20 Watt fluorescent tube, 6V battery and some resistors and pots. the transformer of this emergency....

This power supply circuit is designed around the garden variety  12VAC landscape lighting transformer. Transformer availability and selection has long been a problem for the experimenter, and has often driven them to experiment with dangerous off-line....

The two final power of TR2-TR4 should be mounted on heatsink the right size, otherwise they will overheat. You can choose from MJ4033 MJ3007 or more, provided that the NPN. The maximum power output that can be used depending on the size of the core of the....