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This site contains lots of FREE electronic circuits (schematics) & doityourself (DIY) circuit diagrams for hobbyists, students, professionals etc. covering a wide range of categories in electronics like audio, music,home/garden related,computer hardware,radio,robotics etc to name a few. There are also links to sites that offer hobby electronic kits and other electronics hobby related stuff. Use the menu on the left to browse different circuit categories. You can view the entire electronic circuit schematics index by clicking here.

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Custom Electronics Design & Electronic Product Design Services: Professional design of electronic circuits, circuit boards or complete electronic products which are custom designed according to your specifications at affordable costs. We can custom design your electronics from conception to completion including prototyping & volume production. We are noted for high quality, fast service and low design costs. Check out our company website: www.tronicszone.com for more info or request a free price quote here

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Do you have a circuit that's worth including on this site Send it along and it will be published on the site! Click here for more info.

The information presented on this site is primarily intended as a source of reference to engineers, repairmen, and hobbyists. Most of the projects are given a brief description regarding its operation and hence a person with elementary knowledge in electronics can easily understand its operation.

Before using information on this website please read the disclaimer. Circuit diagrams and component layouts
Circuit diagrams show the connections as clearly as possible with all wires drawn neatly as straight lines. The actual layout of the components is usually quite different from the circuit diagram and this can be confusing for the beginner. The secret is to concentrate on the connections, not the actual positions of components.
The circuit diagram and stripboard layout for the Adjustable Timer project are shown here so you can see the difference.

A circuit diagram is useful when testing a circuit and for understanding how it works. This is why the instructions for projects include a circuit diagram as well as the stripboard or printed circuit board layout which you need to build the circuit.


Drawing circuit diagrams
Drawing circuit diagrams is not difficult but it takes a little practice to draw neat, clear diagrams. This is a useful skill for science as well as for electronics. You will certainly need to draw circuit diagrams if you design your own circuits.
Follow these tips for best results:

Make sure you use the correct symbol for each component.
Draw connecting wires as straight lines (use a ruler).
Put a 'blob' () at each junction between wires.
Label components such as resistors and capacitors with their values.
The positive (+) supply should be at the top and the negative () supply at the bottom. The negative supply is usually labelled 0V, zero volts.
If you are drawing the circuit diagram for science please see the section about drawing diagrams the 'electronics way'.
If the circuit is complex:
Try to arrange the diagram so that signals flow from left to right: inputs and controls should be on the left, outputs on the right.
You may omit the battery or power supply symbols, but you must include (and label) the supply lines at the top and bottom.


Drawing circuit diagrams the 'electronics way'
Circuit diagrams for electronics are drawn with the positive (+) supply at the top and the negative () supply at the bottom. This can be helpful in understanding the operation of the circuit because the voltage decreases as you move down the circuit diagram.
Circuit diagrams for science are traditionally drawn with the battery or power supply at the top. This is not wrong, but there is usually no advantage in drawing them this way and I think it is less helpful for understanding the circuit.

I suggest that you always draw your circuit diagrams the 'electronics way', even for science!

[I hope your science teacher won't mind too much!]

Note that the negative supply is usually called 0V (zero volts).
This is explained on the Voltage and Current page.

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Top Picks in this week:
Contemporary Computer, Electronics and Science Projects choosen by our editors.

Nokia 6280 with SLR optics
This will give you 36x optical zoom on your cell just because of the + the zoom of the lens you may use. It is strongly recomended to use a prime lens for easier calibrating the focal distance.
Added on Nov 19, 2007
Replace a mini USB port on your cellphone
At some point, just about everyone manages to mess up their precious electronics. In this case, someone (not me) somehow managed to totally demolish the mini USB port in their new Motorola cell phone. Surface mount repairs can be challenging without some serious tools, but it\'s possible to replace parts without a rework station.燞ere is how to do that with some fairly inexpensive tools.
Added on Nov 19, 2007
Identifying Electronic Components
Howto identify and locate information for electronics components you can recycle from discarded gadgets. Brandon gives us example pictures and descriptions for most types of electronics components to help you stock up your home electronics lab. This is a must read for new electronics hobbyist.
Added on Nov 19, 2007
Adding Internal USB (and internal ReadyBoost) to a UMPC
Identify the interface and pins on the internal USB port. Find a USB hub that will physically fit into the eo. Find a fast flash drive that will also fit. Cut and wire the internal USB port to talk to the hub. Wire a port on the hub to manage the WiFi or Bluetooth module. Get it all to actually fit.
Added on Oct 15, 2007
DIY laser longdistance listening device
The following project will show how you can use a laser pointer to hear noises from hundreds of feet