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Salt-Taster - Detects the amount of salt contained in liquid foods
(added 3/05) |
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Schematic of a Test Fixture for testing JFETs - (electronic
circuit added 08/08/08) |
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Scheme Detects Shorts - 07/08/99 EDN-Design Ideas....[Note
File contains multiple circuits. Scroll to find this one.] When
you manually assemble complex boards, it's common to short-circuit adjacent
component or IC pins. Determining which section of the circuit you have
shorted is not too difficult, but finding the precise point.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Scheme provides high-side current-sensing for white-LED drivers -
19-Feb-04 Issue of EDN White LEDs find wide use in backlighting
color-LCD screens in most portable devices, such as cellular phones, PDAs,
and MP3 players. Multiple LEDs often connect in series to ensure that the
same current flows through every LED. To forward-bias these LEDs, a voltage
of 10 to 16V comes from an inductor-based boost regulator, such as an
SP6690.... [Design Idea by Dimitry Goder, Sipex Corp, San Jose, CA] |
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Scope Probe Measures High-Frequencies - 01/18/96 EDN-Design Ideas.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for new
link. |
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Selecting the Optimum Test Tones & Test Equipment for Successful High Speed ADC
Sinewave Testing - Maxim Application Notes / 1819 / Sep-08....[App Note]
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Self Oscillating Amplifier for Distortion Testing - allows the home
constructor to make quite accurate measurements, without having to spend a lot of
money on a low distortion oscillator (added 5/02) |
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Self-powered Fast Battery-Tester - Tests 1.5 to 15 Volt cells. Two-LED
display, no power supply required. (electronic circuit added 06/07/08)
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Sense Milliamps to Kiloamps & Digitize to 12 Bits - DN227 Design Notes
(Linear Technology) (app note added 1/06) |
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Sensitive Remote Control Tester - (circuit / schematic design added 6/06)
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Serial port tests digital circuits - 25-Jun-09 Issue of EDN The
circuit in Figure 1 uses a MAX232 IC from Maxim to convert RS-232 voltage levels to
TTL levels (Reference 1]. A 74HC4051 from Texas Instruments lets you select any of
four digital inputs and route them to the serial port (Reference 2]. Listing 1 lets
you control the RTS (ready-to-send] and DTR (data-terminal-ready] pins in the serial
port that selects the signal under test.... [Design Idea by Yury Magda, Cherkassy,
Ukraine] |
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SerialPort tests Digital circuits - The schematic in Figure 1 (shown at the
end of this article) uses a MAX232 IC to convert RS-232 voltage levels to TTL-logic
levels. A 74HC4051 multiplexer lets you select any of four digital inputs and route
them to the serial port. Software available from the online version of this article
lets you control the RTS (ready to send) and DTR (data terminal ready) pins in the
serial port that select the signal under test. The CTS (clear to send) pin then reads
the signal under test into the PC....(Test Ideas. Test & Measurement World 4/01/2009)
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Servo Tester - This circuit can be used to manually turn a servo clockwise
and anti-clockwise. By pushing the forward or reverse button for a short period
of time you can control the rotation of the servo. It will also test a servo….
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Set/Reset Flip Flop - This is an example of a set/reset flip flop using
discrete components. When power is applied, only one of the transistors will conduct
causing the other to remain off. The conducting transistor can be turned off by
grounding it's base through the push button which causes the collector voltage to rise
and turn on the opposite transistor. Copyright 2006 [url=www.bowdenshobbycircuits.info]Bill
Bowden[/url].... |
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Setup Tests Bit Error Rate - 03/18/04 EDN-Design Ideas....Traditionally, the
reception quality of a digital receiver is expressed in terms of BER (bit-error rate].
This figure is the proportion of received bit errors in a given period. Typically, you
measure the BER in the lab by applying an RF signal, modulated by a pseudorandom code,
to the receiver under test.... EDN is migrating links. This link is not verified.
Search the "title" + "EDN" for new link. |
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Short Circuit Beeper #2 - (electronic circuit added 1/05) |
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Short-Circuit Beeper - (schematic / circuit added 6/07) |
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Short-Circuit Finder uses Few Parts - 11/05/98 EDN-Design Ideas....The
simple tester in Figure 1 detects short circuits on assembled pc boards and also
rings out cables and harnesses. The short finder has a narrow zone of threshold
uncertainty and very low "insertion" voltage and current, and it's not confused by
capacitors. The circuit uses an LM10, an IC that combines a precision 200-mV
reference,….contains several circuits, scroll to find this one…. [Design Idea by Boris
Khaykin, Candid Logic Inc, Madison Heights, WI] |
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Short-Circuit Protection for Boost Regulators - DN154 Design Notes
(Linear Technology) (app note added 1/06) |
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Shunt Ammeter Circuit - The Circuit is for a 'Shunt' type ammeter that
allows a meter movement with a small current rating to be used to measure a much
larger current. In this example 1 milliamp through the meter coil will represent 1.5
amps by shunting most of the current through the 0.1 Ohm resistor. [from Rob Paisley's
Model Train web site] |
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