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etc to name a few. There are also links to sites that
offer hobby electronic kits and other electronics hobby
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circuit schematics index by clicking here.
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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
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
This is explained on the Voltage and Current page.
Next Page: Circuit Symbols Studying Electronics
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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
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