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  • Multitone Siren Alarm

    2015-03-03 18:50:33128

    Here the simple schematic of multitone siren alarm circuit. This multitone siren is effective for reverse horns, burlgar alarms, and many others. It ge...

  • High sensitivity anti-theft alarm circuit with high loudness

    2015-03-03 18:43:52111

    The SCR, R2 and L form a triggered power switch with controllable disconnection, L is an anti-theft wire. Transistor VT and IC1 form approximately 2min...

  • Measuring current with microcontroller

    2015-03-03 18:34:5079

    There are many projects where you may need to measure currents. The problem is that basically microcontrollers are equipped with ADC that are used to m...

  • Control in trepte al volumului

    2015-03-03 18:29:0374

    Adaugat in Audio | 1 comentariu Mai multe scheme cu: 4051 4066 74HC132 74HC191 TL082 Circuitul de control in trepte al volumului este compus din trei p...

  • SPC3 9 Amp in / 10 Amp out Solar Power Center

    2015-03-03 18:26:11189

    The SPC3 is a solar power center, it can handle all of the power functions for a solar charged 12 Volt DC system. The SPC3 contains a 9 amp photovoltai...

  • PC interface for point controller CIRCUIT (74LS244)

    2015-03-03 18:23:2986

    This article describes the PC interface for point controller CIRCUIT (74LS244). The principle is very simple, very practical. The circuit components ca...

  • Infra Red Switch control by normal remote

    2015-03-03 18:16:3782

    Circuit : Andy Collinson Email: anc@mitedu.freeserve.co.uk Description: This is a single channel (on / off) universal switch that may be used with any ...

  • Unipolar 4 Phase Stepper Motor Controller circuit (L6506)

    2015-03-03 18:12:32125

    This article describes the Unipolar 4 Phase Stepper Motor Controller circuit (L6506). The principle is very simple, very practical. The circuit compone...

  • The motor overheating and influent protection circuit

    2015-03-03 18:02:53108

    Before the burned-out motor damage, its winding temperature rises high; in many occasions, motor is easily bilging, resulting in burned. The circuit is...

  • Fan Control Circuit (LM317)

    2015-03-03 17:56:54105

    This is an illustrated tutorial on building a variable voltage control for fans and other units, based on the LM317 regulator. It efficiently allows vo...

  • Stereo Preamp With Tone Control Circuit

    2015-03-03 17:49:19214

    A Motorola TCA5500 or TCA5550 can provide a stereo preamplifier system with tone controls. This circuit provides a gain of about 10X, a 14-dB tone-cont...

  • Op amps for Dc motor speed control

    2015-03-03 17:45:23289

    The output of an op amp can swing positive and negative to a maximum voltage close to the supply rail potentials. For example, the maximum output volta...

  • ELECTRONIC_COMBINATION_LOCK

    2015-03-03 17:27:01122

    When button S12 (#) is pressed, a positive voltage fed through R1 appears at the base of transistor Q1, turning it on. When Q1 is conducting, pin 1 of ...

  • Model Train Throttle Control

    2015-03-03 17:25:45169

    What makes this control unique is its momentum feature, which adds a degree of realism. The circuit will opera te well for trains that draw up to 1 A a...

  • Fluid Level Control System Using the LM1830

    2015-03-03 17:23:22118

    This circuit can control the operation of the pump or solenoid valve controls the pressure in the fluid application rate. Where is the LM1830 fluid lev...

  • Power-Off Time Delay Relay

    2015-03-03 17:22:01136

    The two circuits below illustrate opening a relay contact a short time after the ignition or ligh switch is turned off. The capacitor is charged and th...

  • Loudness Control

    2015-03-03 17:15:48126

    When listening to music at low volume levels, bass and treble frequencies are attenuated more than mid frequencies. This loudness control alters the fr...

  • Microcontroller Relay Interface and Driver

    2015-03-03 17:14:2091

    Many microcontroller designs typically mix multiple interfacing methods. A microcontroller (C) system can be viewed as a system that reads from inputs,...

  • ISP Programmer for ATmega32 Microcontroller

    2015-03-03 17:10:28511

    So far I’ve discussed about the micro controller and the compiler software. I’ve yet not written anything about programming. ATmega32 series micro ...

  • Low loss brightness control

    2015-03-03 17:07:3572

    This circuit changes the average value of the dc supply voltage because of the high switching frequency. The tungsten lamp will have an almost continuo...

  • Bend and Twist Your Remote Control to Change Channels

    2015-03-03 17:06:3966

    Piezoelectric devices are getting more and more popular due to their self-generating mechanism. As,? a simple quartz crystal is able to produce an outp...

  • Stepper Motor Controller CIRCUIT (IRL530N)

    2015-03-03 17:03:47117

    This article describes the Stepper Motor Controller CIRCUIT (IRL530N). The principle is very simple, very practical. The circuit components can help yo...

  • Single-control-function-generator

    2015-03-03 16:57:22134

    This function generator, with an adjustment range in excess of 1,000,000 to 1, uses a CA3160 BiMOS op amp as a voltage follower, a CA3080 OTA as a high...

  • Tachometer feedback control

    2015-03-03 16:56:48174

    The system usesH21A1and a chopper disc toofferexcellcent speed regulation when the dynamic characteristics of the motor system and the feedback system ...

  • Microcontroller Explorer Board (PIC18F8722)

    2015-03-03 16:48:3977

    This article describes the Microcontroller Explorer Board (PIC18F8722). The content is very simple, very helpful. Components in this article can help y...

  • RMS Voltage Control Circuit with MOC3021 and BT136

    2015-03-03 16:35:27373

    RMS Voltage Control Circuit with MOC3021 and BT136 Triacis a powerelectronic componentthat conducts in bothdirectionswhen triggered through gate. Figur...

  • SCHMITT_TRIGGER

    2015-03-03 16:20:4999

    The lower trigger point is fixed at 1/3 Vcc, but the upper trigger point is adjustable by means of Pin 5 from 1/3 Vcc to slightly less than Vcc. The Sc...

  • Variable Charger With Voltage Control Circuit

    2015-03-03 16:15:3684

    Description: The following circuit shows about Variable Charger With Voltage Control Circuit. Features: voltage control circuit is equipped to facilita...

  • Car Alarm and Immobilizer 2

    2015-03-03 16:11:16137

    This circuit features exit and entry delays, an instant alarm zone, an intermittent siren output and automatic reset. By adding external relays you can...

  • The detection and alarm device circuit with laser rod

    2015-03-03 16:05:4299

    Analog sound ICs form a receiving circuit, usually the laser emitted by laser rod is irradiated on photoresistor RG, RG shows low resistance, the trans...

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