Electrinic and circuit

Flyback Converter Circuit Diagram

A low-current fly-back converter is used here to generate Â±15 volts at 20 mA from a +5 volt regulated line. The reference generator in the SG1524 is unused with the input voltage providing the reference. Current limiting in a fly-back converter is difficult and is accomplished here by sensing current in the primary line and resetting a soft-start circuit. Flyback Converter Circuit Diagr...

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Look for special discounts and credit offers such as "no payments for 90 days for purchases over a certain dollar amount." These offers enable you to buy multiple items and make payments later without paying high credit card interest. Its a great way to do your holiday shopping from your computer while avoiding the crowded stores. Browse your favorite shopping mall online today to see what latest cell phone accessories are available to fit your budget.The popularity the new smart phones, many of which are multi-functional mobile devices are creating a wave of useful cell phone accessories. As...

DC 12V Car Battery Charger

The circuit has been designed to produce a battery charger for automobiles that are using 12V batteries only. BTY79 is a 10A Silicon controlled rectifier with an operational temperature range from 0ºC to 125ºC. C106D is a 4A sensitive gate Silicon controlled rectifier that functions as reverse blocking thyristors designed for high volume consumer applications such as light, speed control, temperature, process and remote control, and warning systems where reliability of operation is important. Circuit Diagram:DC 12V - Car Battery Charger Circuit DiagramThe...

Four Tone Siren

UM3561 PROJECT CIRCUIT UM3561 IC includes oscillator and selector circuits so few external component is used for construction of four tone siren. The UM3561 contains programmed mask ROM to simulate siren sound. Power consumption of IC is low.It is powered by 3 Volt. One NPN Transistor is used for amplification of audio signal. Circuit Diagram of Four Tone SirenPart List :IC UM3561Resistance = 220 OhmsCondenser 100MfdTransistor BC548Battery Container...

Outdoor Lighting Controller

When you step out of your brightly-lit house into the darkness, it takes a while for your vision to adjust. A solution to this problem is this outdoor light with automatic switch-off. As a bonus, it will also make it a little bit easier to find the keyhole when returning late at night. Often no mains neutral connection is avail-able at the point where the switch-off timer is to be installed, which makes many circuit arrangements impractical. However, the circuit here is designed to work in this situation. The design...

123 Game All MCU Free

This electronic game pits a human player against the ‘machine’. The opponents use a common ‘game token’ and take turns moving along a path by one, two or three steps, and the winner is the first one to reach the goal exactly. Incredibly enough, this simple version of the ‘123’ game can be built without a microcontroller, and it’s almost impossible to beat. The electronics for this is built using only diode logic (Figure 1).123 Game Circuit Diagram - All MCU-FreeThe ‘ input inter face’ consists essentially of 30 miniature sockets to which a probe tip can...

High Current Battery Discharger

If you have a motley collection of 12V batteries in varying states of health, this simple circuit will allow you to easily check their capacity. Its basically a high-current discharge load which is controlled by the NiCd Discharger. This involved increasing the existing 10µF capacitor across LED1 to 100µF, to enable it to supply the brief current pulses required by the clock mechanism. The dischargers "clock connection" now controls a BC457/BD139 Darlington transistor pair (Q1 & Q2) via a 1kO resistor. These in turn activate a car headlamp relay to switch...

Digital Isolation up to 100 Mbits

When it is necessary to send a digital signal between two electrically isolated circuits you would normally choose an optoisolator or some form of transformer coupling. Neither of these solutions is ideal; optocouplers run out of steam beyond about 10 MHz and transformers do not have a good low frequency (in the region of Hertz) response. The company NVE Corporation (www.nve.com) produces a range of coupler devices using an innovative ‘IsoLoop’ technology allowing data rates up to 110 Mbaud. The example shown here uses the IL715 type coupler providing four...

Solar Relay

With extended periods of bright sunshine and warm weather, even relatively large storage batteries in solar-power systems can become rather warm. Consequently, a circuit is usually connected in parallel with the storage battery to either connect a high-power shunt (in order to dissipate the excess solar power in the form of heat) or switch on a ventilation fan via a power FET, whenever the voltage rises above approximately 14.4 V. However, the latter option tends to oscillate, since switching on a powerful 12-V fan motor causes the voltage to drop below...

Solar Battery Protector Prevents excessive Discharge

This circuit prevents the battery in a solar lighting system from being excessively discharged. Its for small systems with less than 100W of lighting, such as several fluorescent lights, although with a higher rated Mosfet at the output, it could switch larger loads. The circuit has two comparators based on an LM393 dual op amp. One monitors the ambient light so that lamps cannot be turned on during the day. The second monitors the battery voltage, to prevent it from being excessively discharged. IC1b monitors the ambient light by virtue of...

Lead Acid Battery Regulator For Solar Panel Systems

The design of solar panel systems with a (lead-acid) buffer battery is normally such that the battery is charged even when there is not much sunshine. This means, however, that when there is plenty of sunshine, a regulator is needed to prevent the battery from being overcharged. Such controls usually arrange for the superfluous energy to be dissipated in a shunt resistance or simply for the solar panels to be short-circuited. It is, of course, an unsatisfactory situation when the energy derived from a very expensive system can, after all , not be used to...

1969 Pontiac Firebird Electrical Wiring DIagram

1969 Pontiac Firebird Electrical Wiring DIagramThe Part of 1969 Pontiac Firebird Electrical Wiring DIagram: down shift switch solenoid, neutral safety switch, backup light switch, stop light switch, coil, breaker, oil press switch, alternator, horn, high beam headlamp, low beam headlamp, parking light, directional signal, marker light, starter, alternator regulator, idle solenoid, wiper motor, battery, parking light, directional signal, windshield washer solenoid, buzze...

AVR Dongle Circuit

This circuit is intended to program AVR controllers such as the AT90S1200 via the parallel port. The circuit is extremely simple. IC1 provides buffering for the signals that travel from the parallel port to the microcontroller and vice versa. This is essentially everything that can be said about the circuit. The two boxheaders (K2 and K3) have the ‘standard’ ISP (in system programming) pinout for the AVR controllers. The manufacturer recommends these two pinouts in an attempt to create a kind of standard for the in-circuit programming of AVR-controllers....

Condenser Mic Audio Amplifier Circuit Diagram

The compact, low-cost condenser mic audio amplifier described here provides good-quality audio of 0.5 watts at 4.5 volts. It can be used as part of intercoms, walkie-talkies, low-power transmitters, and packet radio receivers. Transistors T1 and T2 form the mic preamplifier. Resistor R1 provides the necessary bias for the condenser mic while preset VR1 functions as gain control for varying its gain. In order to increase the audio power, the low-level audio output from the preamplifier stage is coupled via coupling capacitor C7 to the audio power amplifier...

20W CLASS A POWER AMPLIFIER ELECTRONIC DIAGRAM

20W CLASS-A POWER AMPLIFIER ELECTRONIC DIAGRAMThe 0.25 Ohm resistor should cause little grief (4 x 1 Ohm 1W resistors in parallel), but some experimentation may be needed here, since the base-emitter voltage of the BC549 determines the current. This circuit works by using the BC549 to steal any excess base current from the compound pair. As soon as the voltage across the 0.25 Ohm resistor exceeds 0.65V, the transistor turns on and achieves balance virtually instantly.The 1k trimpot in the collector of the first LTP transistor allows the DC offset to be adjusted....

Very Low Power 32kHz Oscillator

The 32-kHz low-power clock oscillator offers numerous advantages over conventional oscillator circuits based on a CMOS inverter. Such inverter circuits present problems, for example, supply currents fluctuate widely over a 3V to 6V supply range, while current consumption below 250 µA is difficult to attain. Also, operation can be unreliable with wide variations in the supply voltage and the inverter’s input characteristics are subject to wide tolerances and differences among manufacturers. The circuit shown here solves the above problems. Drawing...

1992 Audi 80 Wiring Diagram

1992 Audi 80 Wiring Diagram (click for full size image) The Part of 1992 Audi 80 Wiring Diagram: zener diode, panel circuit, heater seat, gear, ignition, ABS control, horn push, tail pilot instrument, tail instrument headlight, capacitor, rectifier, alternator, speedometer illumination, pilot light, fuse and relay, alternator, fuel injection, fuse relay, tachometer illumination, stop lamp, contact breaker, capacitor pack, lighting switch, central and locking circui...

Boost System

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FPF270X Over Current Protection

Using the FPF270X adjustable over-current protection IC can be designed a very simple adjustable current-limiting electronic project .FPF270X provide full protection to systems and loads from excess current conditions.Minimum current limit is adjustable from 0.4A to 2.0A.The input voltage range is 2.8V to 36V. Loads can be activated or deactivated with a low-voltage logic compatible ON pin. Fault conditions can be monitored using the error flag pin and/or the power-good pin.All devices clamp the load current so that it cannot exceed an externally...

Safety Guard Circuit

DescriptionProtect your home appliances from voltage spikes with this simple time delay circuit. Whenever power to the appliances is switched on or resumes after mains failure, the oscillator starts oscillating and D5 blinks. This continues for three minutes. After that, Q14 output of IC CD4060 goes high to trigger the gate of the SCR through D4. At this moment, the voltage is available at the cathode of the SCR, which energizes the relay coil to activate the appliance and D6 glows. Switch SW1 is used for quick start without waiting for delay. Circuit...

Wiring Diagram

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Build a Universal Active Filter Circuit Diagram

The Universal Active Filter Circuit Diagram as shown gives the bandpass operation the transfer function calculated from FBP(s) = where = 1 + s/Qo>0 + s2/w02. The cut-off frequency, 0, and the Q-factor are given by 0 = g/C and Q = gR/2 where g is the trans conductance at room temperature. Interchanging the capacitor C with the resistor R at the input of the circuit high-pass operation is obtained. A low-pass filter is obtained by applying two parallel connections ctf R and C as shown in Fig. 2. The low-pass operation may be much improved with the...

1W BTL Audio Amplifier circuit and explanation

The TDA8581(T) from Philips Semiconductors is a 1-watt Bridge Tied Load (BTL) audio power amplifier capable of delivering 1 watt output power into an 8-Wload at THD (total harmonic distortion) of 10% and using a 5V power supply. The schematic shown here combines the functional diagram of the TDA8551 with its typical application circuit. The gain of the amplifier can be set by the digital volume control input. At the highest volume setting, the gain is 20 dB. Using the MODE pin the device can be switched to one of three modes: standby (MODE...

Flugzeugepiper 32rt Lance

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TDA7360 stereo circuit schematic

TDA7360 stereo circuit schematicAbove circuit diagram shows this TDA7360 stereo test and application circuit schematic. Value recommendation of each external components of this circuit can be described as follows: 1. C1 for input decoupling (CH1) is 0.22 uF2. C2 for input decoupling (CH2)3is 0.22 uF3. C3 for supply voltage rejection filtering capacitor.4. C4 for 22uF standby ON/OFF delay5. C5 minimal 220uF for standby-pass6. 100 nF for C6 with its ability to supply by-pass7. 2200 uF for the C7 of Output decoupling CH2...

Trailer Wiring Electrical Connections Boat

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