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Power-up/down Sequencer Circuit Diagram. Whether you’re talking about a home cinema  or a computer system, it’s very often the case  that the various elements of the system have  to be turned on or off in a quite specific order,  or at least, automatically. Constructing this  sort of automation system is well within the  capability of any electronics enthusiast worthy of the name, but in this ‘all-digital’ age,  most of the circuits of this type to be found  in amateur electronics magazines or web-sites use a microcontroller. Even though that  is indeed a logical solution (in  more ways than one!), and you  might even say the easiest one, it  does pose problems for all those  people who don’t (yet) have the  facilities for programming these  types  of  IC.  So  we  decided  to  offer you now an approach that’s  very different, as it only uses a  simple, cheap, commonly...

This High Power LEDs up to 15 Amperes Circuit Diagram employs a simple scheme that limits the current flow to the LED, you can easily modify the circuit, and can change the power just replacing the value of R2. You can use a DC source of any tensions between 9V to 15V.Para powers or other LEDs just use the approximate formula: Current (I) = 0.8/R2 where I is the current specified by the LED manufacturer. Value of I this conductor is 10A. Use R2 = 0.8/Current formula (I) to determine R2. High Power LEDs up to 15 Amperes Circuit Diagram Parts List Q1 2N3055 or similar NPN transistor R1 1W 220ohms D1, D2 1N4001 silicon diode or rectifier See R2 power for each LED R2 for 1W LED 1W 2.7ohms R2 LED to 1.5 ohms 1W 3W 5W LED R2 to 0.6 ohms or 2 x parallel 1.2-ohms/1W

Sometimes we forget to switch off the bathroom light and it remains on unnoticed for long periods. This circuit solves the problem of electricity wastage by switching off the lamp automatically after 30 minutes once it is switched on. The back-up LED lamp provided in the circuit turns on for three minutes when mains fails. This is helpful especially when you are taking a shower at night. The circuit is built around binary counter CD4060 (IC2), which has a built-in oscillator and 14 cascaded bistable multivibrators. The oscillator generates clock pulses based on the values of resistors R3 and R4 and capacitor C3. Automatic Bathroom Light with Back-up Lamp Circuit Diagram   For the given values, Q11 output of IC2 goes high after 30 minutes of power-on. Resistor R2 resets the IC for proper operation. The output of IC2 is fed to the gate of the SCR via resistor R6 and LED2, which function as a voltage dropper as well as output status indicator. When the SCR gets gate drive, it fires to...

Hello everyone. Today we’re going to do a setup on a Les-Paul-style guitar. For this post, I’ll be setting up a “Burny Super Grade” guitar, but the set up is the same for most Les-Paul-style guitars. I already have a general electric guitar setup post over here: http://diystrat.blogspot.com/2011/03/how-to-set-up-electric-guitar.html, but there are a few Les Paul specific areas I’d like to go into here. Before I start, I want to mention a few things about this particular guitar. It looks and (potentially) sounds great. The neck plays well too, but it has some tuning problems and buzzes a bit more than I’d like. The tuning problems are coming from two areas. Firstly the nut slots are too tight, made evident by the strings making a pinging noise when they are tuned up or down. This means that it is difficult to fine tune, as the string’s pitch tends to “jump” up or down. The second reason for the tuning issues is that the intonation is way out. By that I mean that the saddles’ forwards/ba...