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LM3875 Gainclone Amplifier
Posted on Friday, April 11, 2008   •   Category: Amplifiers


GainClones have VERY few components and this one is based on the National Semiconductor LM3875 IC. The PCBs and components are very simple and quick to make, only took about 20 mins to assemble both amps and rectifier board. DC offset was about 80mV on one channel and about 40mV on the other. I used the optional Ci capacitor in the national datasheet for the IC which reduced it to between 0-4mV: This is the capacitor I chose, its an Elna Starget (expensive). The case was MUCH more time consuming and difficult to make though. I bought all the aluminum from a scrap metal yard including the heatsink. I got my aluminum panels cut at a sheet metal shop as I cant make straight cuts with a hack saw.


1Hz to 1MHz Function Generator with XR-2206 IC
Posted on Thursday, April 10, 2008   •   Category: Frequency Wave Generators


Frequency Generator is an essential laboratory equipment for every electronic. It allows a variety of measurements and experiments. The module described here is based on high quality XR2206 IC and is extremely compact and inexpensive. Output frequency is from 1Hz to 1MHz. It provides sine, square and triangle waves around 1Hz to 1MHz, depending on the timing capacitors used. Over two Potentiometers the amplitude and frequency can be set. About trimmers can also have the purity of the sine signal and the offset of the output voltage can be changed.


Phone Line Controller
Posted on Thursday, April 10, 2008   •   Category: Phone Circuits


It might be "yet another" «device» controller that operates over phone-line, but this one works for sure :) The task was to build a device that connects to the phone line and has a relay as an output switch. It should also sense if the connected «consumer» is turned-on or off and report to the administrator at the other end of the phone line. The administrator would then call-in the device, log in with the password, and check the state of «consumer», turn it on or off, change password or some other settings. Current version has only one relay.


Dual Fan Controller
Posted on Thursday, April 10, 2008   •   Category: PC Circuits


Each fan turns off when the temperature drops 5 degrees below its turn-on temperature. For example, if the dial is set to 80 degrees, the fan turns on at 80 degrees and turns off at 75 degrees. This prevents the fan from cycling on and off rapidly, which would occur if the fan turned on at 80, started to cool the cabinet, and then immediately turned off at 79.


Controlling Devices Through a Computer's Parallel Port
Posted on Thursday, April 10, 2008   •   Category: PC Circuits


This is a very easy and fun to build project that will allow you to control up to eight external devices through your computer's parallel port. You may for instance control different appliances such as lamps, computers, printers, tv sets, radios, music systems, air conditioners, air fans, garden sprinklers and anything else you can think of, all through your computer. You can do a simple test by connecting a LED directly to a ground and any PINs 2 through 9 of your parallel port. The voltage on the parallel connectors is around 4.5V but it drops to around 2V once you connect the LED. You may use a 100 Ohm resistor if you want to, but it is not necessary since the current is very low.


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