Circuit diagram

Electronic Circuits for the Evil Genius

Product Description
There is truly a lack of good, basic hardwire electronic “how-to” books. The market seems interested in this type of fun project compilation. This is another book in our extremely successful “Evil Genius” series. So far, each of the books has sold about $50,000 in less than 3 months.The perfect addition to our “Evil Genius” series, this book details everything an electronics hobbyist would want to know about circuits and circuit design through 57 Lessons. Readers work through 5 distinct, useful projects to reinforce their learning.
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Be the first to comment - What do you think? Posted by admin - April 4, 2008 at 10:30 am

Categories: Circuit diagram Tags: Basic electronics, good-book

12V to 24VDC Voltage Booster

This circuit will double almost any DC input voltage as well as handling plenty of current. 12 to 24V is just an example. With a few changes, it can also supply any desired output voltage.

There are many possible applications. One I can think of would be to get the 28V for the ADC connector on Gigabit Ethernet and later Power Macintosh G4s from the +12V on a standard PC ATX power supply. Basically any time you need more voltage than what you’ve got. Possibly on camping trips when you need 12-14 volts but only have 6V cells. Also you can use it to boost the cooling power of the fans in your computer if they can handle the extra voltage. Some can’t. Keep reading for more on this. What I use it for is to increase the speed and thus the airflow of a standard 80mm DC brushless fan.

Also, if you need the 12v to 15 volt dc booster circuit, we have these circuits,for you to applied in your working.

Read More Source:http://kickme.to/lightningstalker
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Be the first to comment - What do you think? Posted by admin - April 1, 2008 at 1:12 pm

Categories: Circuit diagram, DC converter, Switching Tags: 12V to 24V DC converter, 24v power supply, dc to dc converter step up voltage

Pulse-Generator & Signal-Tracer with BC547,BC557

Dual-purpose test-instrument Very simple circuitry, 1.5V Battery-operated

This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio or radio-frequency stages of amplifiers, receivers and the like for testing purposes. A high-pitched tone can be heard from the speaker of the device under test when all is working properly. The clip must be connected to the ground of the device under test, touching with the probe the different stages of the circuit, starting from the last stage and going up towards the first. When the tone is no longer heard, the defective stage has been found. [...]

Parts:
R1__________________1M 1/4W Resistor
R2,R4_______________2K7 1/4W Resistors
R3________________150K 1/4W Resistor
C1__________________2n2 630V Ceramic or Polyester Capacitor (See Notes)
C2,C3_______________4n7 63V Ceramic or Polyester Capacitors
D1_______________1N4148 75V 150mA Diode
Q1________________BC547 45V 100mA NPN Transistor
Q2________________BC557 45V 100mA PNP Transistor
SW1________________SPST miniature Slider Switch (See Notes)
J1_________________Stereo switched 3mm. Jack socket (See Notes)
Probe______________Metal Probe 3 to 5 cm. long
Clip_______________Miniature Crocodile Clip
B1_________________1.5V Battery (AA or AAA cell etc.)

Read More Source: http://www.redcircuits.com//Page59.htm
Thank you.