circuit harness wiring

Saturday, December 21, 2013

Build a High Voltage Dc Generator Circuit Diagram

High Voltage Dc Generator Circuit Diagram. In the miniature high-voltage dc generator, the input to the circuit, taken from a 12-Vdc power supply, is magnified to provide a 10,000-Vdc output causing a pulsating signal, of opposite polarity, to be induced in Tl`s secondary winding.

The pulsating dc output at the secondary winding of Tl (ranging from 800 to 1000 V) is applied to a 10-stage voltage-multiplier circuit, which consists of D1 through D10, and C3 through C12. The multiplier circuit increased the voltage 10 times, producing an output of up to 10,000 Vdc. The multiplier accomplishes its task by charging the capacitors (C3 tlirough C12); the output is a series addition of the voltages on all the capacitors in the multiplier. In order for the circuit to operate efficiently, the frequency of the square wave, and therefore the signal applied to the multiplier, must be considered.

The output frequency of the oscillator (Ul-a) is set by the combined values of Kv Rr>, and C{ (which with the values specified is approximately 15 kHz). Potentiometer R5 is used to fine tune the output frequency of the oscillator. The higher the frequency of the oscillator, the lower the capacitivc reactance in the multiplier. Light-emitting diode LED1 serves as an input-power indicator, and neon lamp NE1 indicates an output at the secondary of Tl. A good way to get the maximum output at the multiplier is to connect an oscilloscope to the high-voltage output of the multiplier, via a high-voltage probe, and adjust potentiometer R5 for the maximum voltage output.

High Voltage Dc Generator Circuit Diagram

Friday, December 20, 2013

Light Controlled Pond Pump

This circuit was constructed to control the pump in a garden pond, so that it automatically turns on at dawn and off again at dusk. Not only does this mean that we don’t have to get cold and wet when turning the pump on or off manually but it’s also one less job for our kind neighbours when we go away on holidays! The controller is powered from the pump’s existing 25VAC mains transformer. A bridge rectifier (BR1) and 1000μ F capacitor provide DC power to the circuit. For dependable operation, this is regulated to +12V by a 7812 regulator (REG1), while a red LED (LED1) provides power-on indication. The light sensor (LDR1) is a Cadmium-Sulphide photocell obtained from Tandy Electronics. The photocell forms a voltage divider with trimpot VR1.

Light-Controlled Pond Pump Circuit diagram:

With no light on the photocell, the voltage on the base of Q1 is greater than 0.6V and therefore it is switched on. When light falls on the photocell, its resistance decreases, lowering the bias voltage on Q1 and switching it off. This in turn allows Q2 to switch on, energised the relay and turning on the pond pump. In use, the 2.2MΩ trimpot is adjusted so that the pump cuts out at the desired light level. A 47μ F capacitor across LDR1 prevents transient light changes from affecting circuit operation. S1 is a miniature SPDT centre-off toggle switch, allowing the pump to be turned on or off manually, or switched to automatic mode.

The circuit was constructed on a small protoboard from Dick Smith Electronics (Cat. H 5604) and housed in a bulkhead box, which was then attached to the transformer housing. The photocell was soldered to a length of figure-8 cable and sheathed in a short length of heatshrink tubing to form a light probe. This was attached to a nearby fence post to provide suitable exposure to sunlight.

Author: Ian Hogan - Copyright: Silicon Chip Electronics

Source: http://www.ecircuitslab.com/2011/07/light-controlled-pond-pump.html

Thursday, December 19, 2013

Fire Alarm

   Here is a simple circuit which can be used as a Fire Alarm. 3 Volt is enough to operate. There is not much to the circuit. The IC UM66 is connected to its supply and its output fed to a transistor for amplification.
   UM66 is a complete miniature tone generator with a ROM of 64 notes, oscillator and a preamplifier. For amplification we have used a NPN transistor which is BC548. Here BC548 makes a common emitter circuit. For limiting the base current we have used a resistance of 220 Ohms so that transistor will not get damaged even if IC is wrong connected.
   For heat sensor we have used tube light starter in place of manual switch. In a starter there is a metal plate and a pin with small gap. When starter gets heated then metal plate of starter expands and get in contact with the pin and circuit is completed and we get audio from speaker. For fast sensing we can use starter without its glass body by carefully breaking glass cover.

Circuit Diagram of Fire Alarm

MATERIALS REQUIRED

STARTER 1

3V BATTERY 1

IC UM66 1

BC 548(TRANSISTOR) 1

220 OHMS(RESISTOR) 1

Wednesday, December 18, 2013

cell phone jammer should complete the inspection more sensitively

cell phone jammer should complete the inspection more sensitively.
Structure of the internal re-evaluation --- structure of the Ministry of the person in charge of re-evaluation organization departments to focus and do the assessment records, track, modify the results; of Final Appeal of the structural design --- on important issues, the project center is responsible for the final assessment and review of the above assessment conclusions and records; antenna review --- the point inspection of the antenna assessment, combined with the assessment report and the assessment of the vendor to modify, make sure to satisfy the requirements of the manufacturer of the antenna design; structure of the external review --- reference <cell phone the whole structure design checklist ( B. An inter-departmental joint assessment)>, the organization of the market, ID, structure, hardware, software, manufacturing, quality, production technology, procurement sector review, good review records and signature confirmation, according to the accreditation process to modify and confirm. It is the safety action taken for cell phone jammer .
The shrapnel compression ratio to make up to 70%. If the shrapnel bottom contact on the battery y need to consider in advance to the middle of a good battery may be the top up, after the shell gap. As far as possible on both ends and rely on x to the middle position. Advance consideration of better electrostatic problem, the connector is hidden inside the battery or battery cover to prevent static electricity hit on the battery connector. Battery cover from the battery and the connector of the parting line between the joint surface than 4mm. Vertical battery connector rear plus block reinforcement to prevent the fall and rushed to weld foot torn off, resulting in power-down. Block the clearance of the bar and connector 0.2mm. Block tendons to increase the C 0.3mm, for easy installation. It is within the rated jamming range of cell phone jammer .
Vertical connector should pay attention to shrapnel compression direction, not designed to back pressure, or the actual installation may be loaded up. JACK in the z to the structural design support, can not rely on the solder joint support. The xy direction is fixed by the positioning holes. Assembled shell, JACK interference, resulting in the assembly is not easy to check the assembly sequence. Deck at both ends of whether there is space for plug positioning and buckle; whether the anti-ESD measures; headphone plug, the turning point, the rubber thickness of not less than 0.8mm, or they pull off hidden. And root fillet. Hang the headphone plug of shell ribs, thickness of not less than 1.5mm, it will be very easy to pull off. Shell in the headphones at the opening should be larger than the headphone jack in the radial unilateral 0.3. The testing status of cell phone jammer should be reported. When we see a novel and has a high-performance, bright design mobile phone, whether you have such a curiosity, this mobile phone in the end is how the design and manufactured in every time? So today we try to use a technical objective perspective, a brief description of the relationship between the structure of the mobile phone design department and departments, and finally to show the various tests before the phone to be available by the manufacturer, so that we can better understand the mobile phone.

Tuesday, December 17, 2013

Simple Security Monitor

A remote listening circuit. The area to be monitored is connected via a cable and allows remote audio listening.

Starting from the right hand side, the power supply. I have used 12V as a standard power supply voltage, or a 12V car battery may be used. The circuit is in two halves, a remote microphone preamp, and an audio amplifier based around the National Semiconductor LM386 audio amplifier.

Security Monitor Circuit Diagram :
Security Monitor-Circuit Diagram

The remote preamp uses an ECM microphone to monitor sound. A direct coupled 2 stage amplifier built around Q1 and Q2 amplify the weak microphone signal. Preset resistor R2 acts as a gain control, and C1 provides some high frequency roll off to the overall audio response. Q1 is run at a low collector current for a high signal to noise ratio, whilst Q2 collector is biased to around half the supply voltage for maximum dynamic range. The power supply for this preamp is fed via R10 and R6 from the 12V supply. C4 ensures that the preamp power supply is decoupled and no ac voltages are present on the power lines. The amplified audio output from Q2 collector is fed onto the supply lines via C6 a 220u capacitor. The output impedance of Q2 is low, hence the relatively high value of C6. C6 also has a second purpose of letting the output audio signals pass, whilst blocking the dc voltage of the power supply.

At the opposite end, C7 a 10u capacitor, brings home the amplified audio to the listening location. The signal is first further amplifier by a x10 voltage gain amplified using the TL071. C8, a 22p capacitor again rolls off some high frequency response above 100kHz. This is necessary as long wires may pick up a little radio interference. After amplification by the op-amp, the audio is finally passed to the LM386 audio amplifier. R14 acts as volume control. R13 and C12 prevent possible instability in the LM386 and are recommended by the manufacturer. Audio output is around 1 watt into an 8 ohm loudspeaker, distortion about 0.2%. If preferred headphones could be used, although Id recommend a series resistor of the same value impedance as the headphones.

Notes:

You can use this in your garden and listen for any unusual sounds, or maybe just wildlife noises. If you have a car parked in a remote location, the microphone will also pick up any sounds od activity in this area. The cable may be visible or hidden, screened cable is not necessary and you can use bellwire or speaker cable if desired.

Source : http://www.ecircuitslab.com/2012/09/simple-security-monitor.html