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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 Design by Israel Schneiderman
Sferics Detector - Schematic + info + pictures __ Designed by Lennie Zink
Shadow activated (or hand wave) Motion Detector - The circuit below works quite well in typical indoor room lighting. I would not recommend its use in direct sunlight. Two small PIN photodiodes positioned about one inch apart form a shadow detector. With no shadow cast on the devices, both devices produce nearly identical current levelsCircuit Solution by David A. Johnson P.E.-August, 2005
Shaping Amp & Amplitude Detector - 03/15/01 EDN Design Ideas: The use of solid-state detectors connected to charge amplifiers requires appropriate conditioning of the output signals, because of the signals' long decay time. Moreover, you must 'stretch' the peaks of the shaped pulses for a period sufficient for A/D conversion. For a single detector, you can use a relatively expensive module. For a large detector array, you need to develop an ASIC . For a moderate number of detectors, you can use an inexpensive circuit that handles an array of 19 drift diodes connected to a scintillating crystal of cesium-iodide (Figure 1). Design by Elio Rossi
Shock Sensor Amplifier (Accelerometer) - A shock sensor is a capacitive piezoelectric element which generates a charge under physical acceleration. This charge can be converted to a voltage and filtered using high valued resistors and a high input impedance CMOS
amplifier such as the LTC6081. This circuit has a gain of 100 and output 109mV per g of acceleration__ Linear Technology/Analog Devices App Note, Mar 16, 2010
Shock-Sensor Prevents Data Corruption - 07/04/96 EDN Design Ideas: Hard-disk drives for laptop and other portable applications need to withstand significant g-force shocks when operating. A typical 1.8-in. drive writes servo information over less than 15% of the disk's active area, which means that the read/write head spends more than 85% Design by Carolyn Platt, Raltron Electronics Corp, Miami, FL
Short Beeper #2 - The One Chip Beeper is an audible continuity tester. it works well in circuits that already have components installed because only wires and low value resistors will cause a tone. The One Chip Beeper will not turn on diode junctions or damage sensitive circuits. The one piece construction is compact and easy to use. No power switch is needed due to its very low power consumption. Use any 9 volt battery. Aninexpensive carbon/ zinc battery will last almost forever __ Contact info @ rhoent.com
Short tracer/finder uses low power - 9/07/2014-EDN Design Ideas: Build this bench tool and become a master at pinpointing shorts. Design by Dan Meeks
Short-Circuit Beeper - Schematic Only__
Short-Circuit Finder uses Few Parts - 11/05/98 EDN Design Ideas: (File contains several ciruits. Scroll to find this one) 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, Design by Boris Khaykin, Candid Logic Inc, Madison Heights, WI
Short-Circuit Protection for Boost Regulators - DN154 Design Notes__ Linear Technology/Analog Devices
Shorted Turns Tester - No TV or monitor technician should be without this unit. Build it and you'll wonder how you ever got along without it.__ SiliconChip
Shower Stopper - The shower stopper is a project suggested by one of the readers of the Technical Library. His request was for a circuit that would activate a solenoid to shut off the hot water to the shower after a reasonable length of time. it seems that certain members of his household enjoy long, warm showers. This circuit is probably sadistic! The circuit detects when the hot water is turned on in the shower by means of a __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Shunt Regulator Monitors Battery Voltage - 18-Sep-08 EDN Design Ideas: A shunt regulator and a handful of associated components function as a battery monitor Design by Vladimir Rentyuk, Modul-98 Ltd, Zaporozhye, Ukraine
Signal Conditioning for Platinum Temperature Transducers - DN45 Design Notes__ Linear Technology/Analog Devices
Signal conditioning precisely indicates humidity - 02/02/98 EDN Design Ideas: The circuit in Figure 1 translates the level of humidity from0 to 100% into a stable, respective dc signal of0 to 100 mV. The heart of the circuit is IC 1, the iH3602-C relative-humidity sensor (Microswitch/HyCal Sensing Products, Freeport, iL]. This device operates on 5V at 200 mA and provide as a dc output of0.8 to 4.0V Design by William Whitehead, Lafayette, CO
Signal Injector / Tracer - A simple test circuit to fault find audio and radio equipment. Can be used to inject a square wave signal, rich in harmonics, or used with headphones as an audio tracer. __ Designed by Andy Collison
Signal Sources, Conditioners and Power Circuitry Circuits of the Fall, 2004 - Linear Technology AN98 __ Designed by Jim Williams - Nov 19th, 2004
Signal Tracer & Injector -
A simple test circuit to fault find audio and radio equipment. Can be used to
inject a square wave signal, rich in harmonics, or used with headphones as an
audio tracer.
[Designer: Andy Collison]
Signal-to-noise-meter - Noise level measured into 75ohm 3.1kHz BW using Siemens D2006 level meter: -80dBU (77.5mV) from zero to 1MHz and drops 3dB on 17MHz. Decrease the first coupling capacitor (68nF) to 10nF to increase the lower limit to 50kHz. The amplifier is copied from one of LA7Mi's constructions, combined with a general audio amplifier. __ Designed by Jan-Martin Nøding
Signature Analyser - A component signature analyser that allows in-circuit parts tests __ Designed by Rod Elliott ESP
Simple Sensitive Remote Control Tester - Here is a handy gadget for testing of infrared (iR) based remote control transmitters used for TVs and VCRs etc. The IR signals from a remote control transmitter are sensed by the...__ Electronics Projects for You
Simple Smoke Detector - This simple smoke detector is highly sensitive but inexpensive. it uses a Darlington-pair amplifier employing two npn transistors and an infrared photo-interrupter module as the sensor. The circuit gives audio-visual alarm...__ Electronics Projects for You
Simple Amplifier With Lm1875 And Up To Six Transistors - introduction for testing and experimenting purposes we in need of power AC or DC amplifier with low cost and easily reparable.in these cases the THD and the iMD of the amplifier are...__ Electronics Projects for You
Simple Circuit 2.4 GHz SWR Meter - Simple way to tune wireless LAN antennas using an oscilloscope. __ Amateur Radio circuits from Green Bay Professional Packet Radio
Simple Circuit 500V High Side Current Monitor - Adding two external MOSFETs to hold off the voltage al-lows the LTC6101 to connect to very high potentials and monitor the current flow. The output current from the LTC6101, which is proportional to the sensed input volt-age, flows through M1 to create a ground referenced output voltage. __ Linear Technology/Analog Devices App Note, Mar 30th 2010
Simple Circuit 6 Digit 40MHz Frequency Counter Module - Here is a design for a very low cost 6-digit frequency counter module using offshelf components (and not that expensive 74C926!). The standard circuit will display directly in Hz (1MHz max) , and re is a separate on board divider that will allow you to display directly in KHz (approx 40MHz max). Becausedisplay reads directly in Hz or KHz re is no __ Designed by David L. Jones
Simple Circuit Anticipator Improves On Earlier Idea - EDN Design Ideas: 05/24/2012 A self-biasing thermistor circuit had an overall dominant thermal/electrical time constant as small as 25 msec but had a significantly rounded response following a square (thermal) input pulse of 100 msec; the source was a pulsed blue LED. A single-op-amp-based “anticipator-like” circuit generated a more faithful picture of the actual input excitation, and improved on the circuit described in a previous Design ideas (Reference 1). The lowpass filter in Figure 1, with an RC time constant of approximately 25 msec, models the circuit. Design by Nicholas Lockerbie, Scottish Universities Physics Alliance, Glasgow, Scotland
Simple Circuit Battery-Status Indicator Uses Two LEDs - 08/12/10 EDN Design Ideas: Use LED brightness to indicate battery charge. Design by Abhijeet Deshpande, People’s Education Society Institute of Technology, Bangalore, India
Simple Circuit BFO metal Detector - Not the best, but Simple, and Now with a PCB. __ Designed by G.L. Chemelec
Simple Circuit BFO Metal Detector - BFO (beat frequency oscillator) metal detectors use two oscillators, each of which produces a radio frequency. One of these oscillators uses a coil of wire that we call the search loop. The second oscillator uses a much smaller coil of wire, and is usually inside the control box and is called the reference oscillator. By adjusting the oscillators so their frequencies are very nearly the same, the difference between them is made audible as a beat note __ Designed by Essex Metal Detectors
Simple Circuit BFO Metal Detector - This simple BFO metal detector requires only a few of components and an evening's work. The two oscillators are simple Colpitts designs using BJT transistors. The reference oscillator's frequency is approximately 370kHz, slightly tunable with the help of a silicon varactor diode. The outputs of the two oscillators are fed to a mixer made with Q3 and Q4. The signal then goes through a low-pass filter (R13, C13) and a JFET preamp. The LM386 audio amplifier has a gain of 20, more than enough for most headphones. if you need more gain, you can add a 10uF capacitor between pins 1 and 8.__ hobbyteam @ hobby-hour.com
Simple Circuit Bidirectional DC Motor Speed Controller - The LT1970 is a ±500mA power op amp with precise externally controlled current limiting. Separate control voltages program the sourcing and sinking current limit sense thresholds with 2% accuracy. Output current may be boosted by adding external power transistors. __ Linear Technology/Analog Devices App Note, Apr 5th 2010
Simple Circuit Blown-Fuse Indicator Sounds an Alarm - 10-Jul-08 EDN Design Ideas: A simple blown-fuse-indicator circuit sounds a buzzer and flashes an LED when a fuse blows Design by Vladimir Oleynik, Moscow, Russia
Simple Circuit but reliable car battery tester - This circuit uses the popular and easy to find LM3914 IC . This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source. __ Designed by Jonathan Filippi
Simple Circuit Capacitance Meter - Operates in conjunction with a voltmeter; 1pF to 22µF in six Ranges - 9V Battery supply __ Contact Flavio Dellepiane, fladello @ tin.it
Simple Circuit capacitance meter bins parts - 03/24/14 - EDN Design Ideas: This simple, elegant circuit lets you quickly sort through capacitors - The heart of the circuit is the RS flip - flop using 4093 NAND gates along with transistors Q1 and Q2, which discharge the reference and test capacitors respectively. The reference capacitor (CREF) and the test capacitor (CX) are charged from zero volts, followed by a reset pulse applied to the bases of Q1 and Q2 Design by Raju Baddi
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