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UJT Test - This testing procedure is for use with a digital multimeter in the
OHM's test-range. The UJT is a solid-state 3-terminal (TO-18 case) emiconductor.
UJT's are used in pulse/timing, oscillator, sensing, and thyristor triggering
circuits. The most common one being probably the 2N2646 from Motorola. (Tony van
Roon's design added 2/06) |
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UL Ground Resistance Tester - UL requires that an electrical system using a metal
chassis earth ground connection have a resistance of less than 0.1 ohms. This
resistance must be tested with actual line current in excess or 10 amps. The
circuit shown uses a couple of LEDs to indicate if in fact the resistance is less than
0.1 ohms. It uses a modified transformer to produce a 2.5vac output with at
least 10 amps of supply current. ….(designed by David A. Johnson) |
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Ultrasonic Range Meter - This circuit is measuring the range to an object by using
ultrasonic transmitter and ultrasonic receiver. The distance is calculated by PIC
microprocessor and is displayed on the three digit 7-segment LED display.
….(electronic design added 10/06) |
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Unusual clock with AT89C2051 - ….(electronic schematic added 08/08) |
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Use a PC's printer port to measure frequency - 10/26/95 EDN-Design Ideas:
(design idea added 11/05) |
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Use a switching regulator controller to generate fast pulses - 04/13/06 EDN-Design
Ideas: Switching-regulator-controller ICs can deliver gate-drive pulses with
rise and fall times of less than 2 nsec, making them ideal candidates for laboratory
pulse-generators.....(design idea added 9/08) |
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Use OpAmp injection for Bode analysis - 09/16/04 EDN-Design Ideas: Bode
analysis is an excellent way to measure small-signal stability and loop response in
power-supply designs. Bode analysis monitors gain and phase of a control loop. It
performs this monitoring by breaking the feedback loop and injecting a signal into the
feedback node and then comparing the injected signal with the output signal of the
control loop.....(design idea added 1/05) |
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Use RS232C Port to Measure Pressure - 08/01/97 EDN-Design Ideas: A simple
circuit and accompanying software turn a pressure sensor into an accurate and cheap
pressure digitizer that works with any PC's RS-232C COM port. Many manufacturers make
micromachined silicon piezoresistive pressure sensors.....(design idea added 6/06) |
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Use Your Printer Port as a High Current Ammeter - 07/06/00 EDN-Design Ideas:
-With a few inexpensive components and INT1Ch, you can turn the printer port of your
PC into a high-current ammeter.....(design idea added 6/06) |
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Using Vector Modulation Analysis in the Integration, troubleshooting and Design of
Digital RF Communications Systems - Aligent Application Note (app note added
6/07) |
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UTP Cable tested - (schematic added 8/03) |
