Friday, July 26, 2013

Unregulated Power Supply

This page come from ww.zen22142.zen.co.uk, show you about circuit of un regulated powersupply:
A basic full wave rectified power supply is shown below. The transformer is chosen according to the desired load. For example, if the load requires 12V at 1amp current, then a 12V, 1 amp rated transformer would do. However, when designing power supplies or most electronic circuits, you should always plan for a worst case scenario. With this in mind, for a load current of 1 amp a wise choice would be a transformer with a secondary current rating of 1.5 amp or even 2 amps. Allowing for a load of 50% higher than the needed value is a good rule of thumb. The primary winding is always matched to the value of the local electricity supply.
Unregulated Power Supply circuit diagram
Notes:
An approximate formula for determining the amount of ripple on an unregulated supply is:
Vrip = Iload * 0.007 / C
where I load is the DC current measured through the load in amps and C is the value of the capacitor in uF.The diagram below shows an example with a load current of 0.1 amp and a smoothing capacitor value of 1000uF.
The calculated value of ripple is (0.1 * 0.007) / 1000e-6 = 0.7 volts or 700mV. The value of peak-peak ripple measured from the graph is 628mV. Therefor, the equation is a good rule of thumb guide for choosing the correct value for a smoothing capacitor in a power supply.
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Battery 9V Voltage Doubler

electronic circuit diagram
MAX1044 is a charge pump converter - it uses a capacitor as a "bucket" to pump charge from one place to another. Normally, there is a capacitor connected from pin 2 of the 1044 to pin 4. This capacitor is charged between +9V and ground, and then switched in parallel with a capacitor from pin 5 to ground in a way that makes a negative voltage on the second cap.
In this UPverting use, the 1044 still switches pin 2 between +9V and ground just as it would for a voltage inverter. However, we ignore the pin 4 and 5 connections that would make an inverter from it. Instead, we connect two capacitors and diodes as shown (D1, 2, and C1, 2). The voltage on pin 2 of the 1044 is switched from +9V to ground. When it switches to ground, C1 fills with voltage through D1. When it then switches to +9, it pulls the negative terminal of C1 up to +9V. D1 now blocks any flow of current back into the battery, so the charge in C1 flows through D2 into C2. So at C2, we now get almost 18V!
There's more. If we add another two diodes and capacitors (D3, D4 and C3, C4), we can add another 9V to it, as C3 charges to +18 through D3 when pin 2 is at ground, and is pulled up to +25 (+27 minus the voltage drops of the diodes) when pin 2 goes high. We can do it again with D5, D6 and C5, C6 to get +33V. The limit on all this is the losses in the diode voltages. Each time we add a section, we add two more diode drops that we can't take advantage of to charge capacitors. But +33 is not bad for a single 9V battery!
If you build this, you MUST take notice of the voltages on the capacitors. The caps can all be the same value, but C1, C2 need to be 25V units, C3, 4, 5, and 6 can be 35V units, and C5 and C6 might need to be 50V unit just for some safety margin. 1N400x diodes work and are cheap, but the losses are higher than they really need to be. For higher performance and lower losses, it's better to use something like the 1N5817 schottky diodes for low losses. But both will work.
This charge pumping is a very efficient way to convert voltages. The only power lost is that power dissipated in the resistances of the switches inside the 1044 and the series resistance of the capacitors and diodes, as well as the power to run the internal oscillator that flips the switches when needed.
All by itself, the 1044 runs at about 7-10kHz, so there will be ripple of that amount on the C2 output and on the +9V output from the battery as well. Audio equipment that uses this voltage could have a "whine" audible if you're not careful. However, the 1044 has a frequency boost feature. If you connect pin 1 to the power supply (shown by the little open switch) then the oscillator frequency goes up by about 6:1. The oscillator then works well above the audio region. Any whine is then going to be inaudible.
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Audio Line Driver

Audio line driver schematics:
Audio Line Driver circuit diagram

This preamplifier has a low output impedance, and is designed to drive long cables, allowing you to listen to a remote music source without having to buy expensive screened cables. The very low output impedance of around 16 ohms at 1KHz, makes it possible to use ordinary bell wire, loudspeaker or alarm cable for connection. The preamplifier must be placed near the remote music source, for example a CD player. The cable is then run to a remote location where you want to listen. The output of this preamp has a gain of slightly less than one, so an external amplifier must be used to drive loudspeakers.
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Tuesday, March 26, 2013

reference manual and diagram for Tecumseh

This is a complete reference manual for Tecumseh HM80 engine repair I found through a search engine. after seeing and studying in it there are many parts that I had not knowing to knowing. with you I am looking for information Tecumseh hm80 wiring diagram to learn that then you want to apply for a private workshop.and perhaps the future I will call a technician to be able to explain more fully about how engines work. if you want to get this manual you can find it here without any charge.

I know your book is expected to make it easier for owners to be able to repair the engine itself though is not easy, but at least it can ease the work and identify each component part in it.you can find the owner's manual on this page, do not forget to always be careful if you want to do it yourself.
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Tuesday, October 30, 2012

2005 Acura NSX Luxury Sports Service Manual

Honda NSX, Acura NSX or a sports car produced between 1990 and 2005 by Honda Japan. Using a sporty engine, rear wheel drive layout, the Electronic Control petrol powered V6 engine and Variable Valve Timing (VTEC) system. For 2005, Acura NSX has a 2 door and is Acura most expensive models in its class, standard features include 17-inch wheels, a removable aluminum roof panel, HID lamps, remote keyless entry, automatic climate control, a 165-watt Bose stereo with CD changer and leather seating. The design of this car is really sporty, stylish, and very luxurious. 


2005 Acura NSX engines are equipped with the 3.2-liter V6 engine makes 290 horsepower and 224 pound-feet of torque. It’s coupled to a close-ratio six-speed manual transmission. A four-speed automatic is also available, but equipping the car as such mandates a smaller 3.0-liter V6 and drops the horsepower rating down to 252. With the six-speed, the NSX can accelerate to 60 mph in about 5 seconds and has a top speed of 175 mph.


download 2005 Acura NSX Luxury Sports Service Manual here

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2002 luxurious Volvo C70 Sports Coupe manual guide

from 2002 Volvo C70 comes as luxury car or convertible sports coupe sports car that has two doors that can accommodate four passengers. This car has standard features include 17-inch sedan models of wheels and tires, power sunroof, leather upholstery, trip computer, auto-dimming rearview mirror, stability and traction control system (STC). And convertible models will also feature 17 alloy wheels rays, real wood dash trims overrides the effect of "wood" trim on the tourist package optional for C70 LPT convertible.  five-speed manual transmission is standard, and a five-speed automatic with winter mode is optional. Whereas the C70 HPT convertible equipped witha 2.4-liter turbocharged five-cylinder that makes 190 horsepower and 199 lb-ft of torque. This engine is only available with the automatic.


2002 Volvo C70 has standard equipment includes dual-stage front airbags, side-impact airbags, daytime running lights, all disks of antilock brakes and Whiplash Protection System (whips Volvo), which moves the front seats rearward in a collision. The side impact airbags are designed to protect the occupants in the chest, head and upper body. Traction and stability control, and four-wheel ANTILOCK disc brakes are standard.Or you can get the article directly in the URL below:


download 2002 luxurious Volvo C70 Sports Coupe manual guide here

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Owners Manual 2011 Volvo C30 comfortable Sport Sedan

The Volvo C30 comes as a luxury sedan car that has two-door hatchback that can accommodate four passengers. This car is available in two trim levels namely T5 and R-Design. For the base models T5 features includes alloy wheels, 17 inches, height-adjustable seats, a trip computer, cruise control, full power accessories, Bluetooth and a CD audio system with eight speakers with an auxiliary audio jack. Whereas models R-Design adds 18-inch wheels, foglights, a sport-tuned suspension, steering ratio faster, outdoor sports trim, leather upholstery, blue face gauges and metallic interior trims.


 here is Owners Manual 2011 Volvo C30 comfortable Sport Sedan

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