Mutchus

Well hello everyone. Today we’re going to talk about cigar box guitars (CBGs). For a while now, I’ve been noticing more and more references to CBGs creeping into popular websites, including one of my favourites, boing-boing.net. Here are a couple of recent articles from there: http://boingboing.net/2012/04/13/cigar-box-guitars-book-photo-g.html http://boingboing.net/2012/02/14/grand-re-opening-of-the-cigar.html It was my birthday last month and my friend Mike bought me a copy of “Cigar Box Guitars” by David Sutton. It’s a great book that explains not only how to make four different cigar box guitars, step by step, but also interviews some very interesting characters involved in the cigar box guitar scene. I decided to have a go at making one of the CBGs described in the book, and that’s what this post is about. Firstly I got my hands on a Cigar box, graciously donated by another very good friend of mine (thanks, Kevin). I searched around for a while for suitable scrap wood for the n...

Description  The LED flasher circuits below operate on a single 1.5 volt battery. The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED. The top left circuit, designed by Andre De-Guerin illustrates using a 100uF capacitor to double the battery voltage to obtain 3 volts for the LED. Two sections of a 74HC04 hex inverter are used as a squarewave oscillator that establishes the flash rate while a third section is used as a buffer that charges the capacitor in series with a 470 ohm resistor while the buffer output is at +1.5 volts. When the buffer output switches to ground (zero volts) the charged capacitor is placed in series with the LED and the battery which supplies enough voltage to illuminate the LED. The LED current is approximately 3 mA, so a high brightness LED is recommended. In the other two circuits, the same voltage doubling principle is used with the addition of a transistor to allow the capacitor to discharge ...

This is a simple and low-cost automatic turn-off electronic circuit diagram; this circuit provides an automatic turn-off feature after a time that can be set from 1 minute to 10 minutes by the 470k pot. Circuit Diagram:

This will flash a LED, employing a single 1.5v cell. it's going to even flash a white LED even supposing this kind of LED needs regarding three.2v to 3.6v for operation. The circuit takes regarding 2mA however produces a really bright flash. LED on 1.5v SUPPLY A red LED needs regarding one.7v before it'll begin to illuminate - below this voltage - NOTHING! This circuit takes regarding 12mA to illuminate a red LED employing a single cell, however the fascinating feature is that the approach the LED is illuminated. The 1u electrolytic may be thought of to be a 1v cell. (If you wish to be technical: it charges to regarding one.5v -0.2v loss as a result of collector-emitter = one.3v and a lost of about 0.2v via collector-emitter in diagram B.) It is firstly charged by the 100R resistor and therefore the third transistor (when it's totally turned ON via the 1k base resistor). this is often shown in diagram "A." throughout this time the second transistor isn't turne...

This is a Simple 1 Amp Current Injector Circuit Diagram . A voltage booster provides the current control circuit with a higher voltage, to insure the electronic circuit operates properly, even as the battery voltage drops. A single LED provides both power monitoring and a low battery indicator. The current source is activated when a pushbutton switch is pressed. With a good digital voltmeter, you can use this device to measure resistances down to less than one micro ohm.   Simple 1 Amp Current Injector Circuit Diagram That is 0.000001 ohms. I often use it to measure contact resistance of a relay or the resistance of big chunk of heavy gauge wire or the resistance of a copper trace on a circuit board. You can also use it to measure the voltage drop of a power diode, when conducting one amp of current. 

10Mhz to 1 MHz Frequency Converter Circuit Part ListIC1 7404 = 1 IC2 7490A = 1 R 1 K = 2 R 3.3 K = 1 C Trim Polymer 39 pF = 1 C Electrophoresis 4.7 uF 16V = 1 C Milar 47 nF 16 V = 1 C Milar 10 nF 16 V = 1 C Ceramic 68 pF 50 V = 1 

Small 1.5V to 5V or 12V DC/DC converter with LT1073 chip. The IC is available in three different versions, depending on output voltage. Two with fixed output voltage of 5V and 12V, and the most interesting that can be adjusted. The adjustment is done through a voltage divider with two resistors, of mass, output and Terminal 8, internally connected to the voltage comparator IC, which is responsible for stabilizing the output voltage. LT1073 has an internal everything you need to make a small DC / DC converter with a low operating voltage of only 95μA 1V and consumption without load. If you do not have a meter inductance, the inductive part of the drive is a bit more complicated to make, but we shall see some possible solutions. Capacitor also recommended by the manufacturer for the circuit is a bit hard to get, I have used a tantalum recovered from another power source, and the ripple voltage at the output is quite low. Last but not least, say that the diode has to be a fast, not wo...

Experts a nd amateurs have been Experimenting with radios without batteries since the wireless communication started. In many designs we've seen radios that operate without power, but all are known to use the diode 1N34. (Crystal Radio). Although significant improvements have increased the sensitivity and selectivity of these system circuits, Performances were limited until new techniques have emerged.    Here we have the first transistor radio that works without batteries, it is powered by random electric fields are everywhere in the atmosphere.  These circuits are relatively cheap to manufacture, have more volume and better reception from the crystal radios.   This circuit is a medium wave receiver and attaches easily to frequencies from 500Khz to 11Mhz. To get good results in the reception of radio stations, we should give great importance to the ground and the antenna. To listen to distant and weak stations we have to use a battery 9volt parallel with the capaci...