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Electronic Projects
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Electronic Construction
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Last Updated on:
Wednesday, November 29, 2017 05:39 AM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Build an adjustable high-frequency notch filter - 6-Feb-03 Issue
of EDN Although you can obtain universal, resistor-programmable
switched-capacitor filters that are configurable as notch filters, most
cannot operate at bandwidths higher than 100 kHz. Further, the typically 16-
to 20-pin packages do not include a continuous-time, antialiasing filter to
prevent spurious signals from appearing at the output.... [Design Idea by
John Ambrose, Mixed Signal Integration Corp, San Jose, CA] |
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Build An Audible Milliohmmeter - This project uses a four-point
resistance measurement process also known as the Kelvin method. This
procedure uses a current source to determine the value of an unidentified
resistance. A ....(circuit added 03/09) |
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Build an Infrared Night Scope - Building a night scope is easy if
you have the heart of it which is the image intensifier part. I would
recommend using the PVS-5 module which uses 'MCP' or Micro Channel Plate
technology. This is a U.S. 2nd generation device and is rated at
15,000 times light gain. The resolution is one of the best on the market. It
was used in Desert Storm....ASCII format. (circuit / schematic design
added 6/06) |
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Build the Lightning Bulb - The Lightning Bulb circuit uses a quadrac (see
Fig. 1)--a device that combines a triac and a diac trigger in a single package--to
control the supplied current. Figure 1A shows the schematic symbol for the quadrac,
while figure 1B shows the pinout for the unit used in our circuit. Note that quadracs
are increasingly difficult to come by;…. [by Vincent Vollono] |
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[_OLD-ads-dont_upload/OLD I-ADS from web/ad-djandassoc.htm] |
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Build this add on Capacitance Meter - This simple add-on capacitance meter
has been specially designed to help you identify capacitors from 1p to 10u. There has
always been a problem identifying capacitors, due ….(schematic / circuit added 05/07)
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Build This High Quality Headphone Amplifier - Especially good for listening
to digital recordings, this headphone amplifier features an opamp front-end with
complementary bipolar outputs for excellent linearity and high-drive capability. It
exhibits low noise, can drive headphones of any impedance and protects against shorts.
Designed by Earle Eaton (Circuit design added 04/05/06) |
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Build this Negative Ion Detector - Figure 1 shows a schematic diagram of the
Ion Detector--a rather simple circuit consisting of three transistors (two PN2907 PNP,
and a single PN2222 NPN type), three resistors, one capacitor, an antenna, a mA meter,
and an LED.... [by Vincent Vollono] |
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Build your own 89C51 PABX - This 89C51 PABX project is basically an eight
line intercom from which you can call one to eight numbers. The 89C51 PABX system also
supports dialling and receiving telephone calls….(circuit / schematic added 09/08)
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Build your own bypass-capacitor tester - 6-Dec-01 Issue of EDN Most
circuits use bypass capacitors and can deliver substandard performance if the
capacitors have poor pulse characteristics. Few if any articles cover how to test
bypass capacitors for pulse characteristics. The circuit in Figure 1 tests these
characteristics. It charges the capacitor under test through 100 kU for approximately
1 msec and then discharges it through 10U for a.... [Design Idea by Carl Pugh, Pugh
Magnetics, Newark, CA] |
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Build your own iRDA SIR Transceiver Dongle using MCP2120 - (electronic
circuit added 4/05) |
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Electronic Construction Projects:
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