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Beta: Welcome to the Circuit Search section of ElectronicsWeekly.com. Let us have your thoughts on any of the circuits below, or suggestions for new circuits, simply by emailing circuits@electronicsweekly.com
Posted: 19 November 2008
| Measurement circuit diagram - DC-accurate, 32-bit DAC achieves 32-bit resolution | |
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You need to change only R1 and C1 to accommodate any convenient frequency. W Stephen Woodward, Chapel Hill, NC | |
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Some applications, such as ADC testing and calibration, require a DAC with extremely good resolution, monotonicity, accuracy, and resolution. In these categories of performance, this circuit is hard to beat. Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 7 October 2008
| Instrumentation circuit diagram - instrumentation amps having voltage gains | |
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The output of A2 connects with reference input REF1, and reference input REF2 serves as a freely usable reference. Marián Štofka, Slovak University of Technology |
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You can use this circuit for applications requiring instrumentation amps having voltage gains of three or 10 and the ability to process voltages as low as 1 mV. Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 7 October 2008
| Alarm Circuit Diagram - Alarm monitors rotational speed of dc motor | |
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The impulses on R1, arising from commutation in the fan’s brushless motor, start up the Schmitt trigger, Q1/Q2, which controls transistor switch Q3, commutating the sense pin of the fan’s motherboard connector Peter Demchenko, Vilnius, Lithuania | |
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This schematic covers monitoring the rotating speed of a DC fan motor, sounding an alarm and powering down if the motor stalls. Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 18 September 2008
| Generator Circuit Diagram - Locked-sync sine generator | |
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The circuit's general-purpose binary frequency divider, the 74HC4060, connects between the VCO output and the 74HC4046 feedback input and has a division ratio of 64. Vladimir Rentyuk, Modul-98 Ltd, Zaporozhye, Ukraine |
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This sine-wave generator can synchronize a sine-wave output through three decades of frequency and maintain low THD and constant amplitude. Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 16 September 2008
| Power Circuit Diagram - Shunt regulator monitors battery voltage | |
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When battery voltage is higher than the threshold, the cathode voltage of the TL431 is at its low level of approximately 2V, and transistor Q1 turns on, lighting LED1. Vladimir Rentyuk, Modul-98 Ltd, Zaporozhye, Ukraine | |
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A TL431 shunt regulator is a perfect choice for many applications. You can use it as a comparator with hysteresis by taking advantage of its inner voltage reference along with few additional components. ... Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 16 September 2008
| Power Circuit Diagram - Add margining capability to a dc/dc converter | |
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The extra IC is a two- or four-channel, I2C (inter-integrated-circuit)-adjustable-current DS4402 or DS4404 DAC. Brian Vasquez, Maxim Integrated Products, Dallas, USA. |
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You can easily add margining capability - that is, the ability to digitally adjust the output voltage - to a dc/dc converter by making a single connection to the circuit... Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 27 August 2008
| LED Circuit Diagram - Astable multivibrator lights LED from a single cell | |
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The square-wave drive signal at Q2's collector turns a PNP switching transistor, Q3, on and off. Luca Bruno, ITIS Hensemberger, Monza, Lissone, Italy | |
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The simple astable multivibrator provides a low-cost way to drive an LED from a single cell. Lighting LEDs from a single 1.5V cell poses a problem because their forward voltages are higher than the cell's... Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 07 August 2008
| Control Circuit Diagram - Circuit adds functions to a monostable multivibrator | |
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The falling edge of the output pulse of the NAND gate triggers the monostable multivibrator to generate the first gate pulse of predefined gate width... PM Ishtiaq, S Mufti, MA Darzi, and GN Shah, Nuclear Research Laboratory, Bhabha Atomic Research Centre, Kashmir, India | |
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By adding counters and an oscillator to the output of a monostable multivibrator, you can generate any number of output-gate pulses. Gate generation is often an inevitable step in digital-signal processing. Invariably, the gate generation during event processing in a digital system uses the input trigger of a monostable multivibrator... Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 28 July 2008
| Control Circuit Diagram - Sample-and-hold amplifier holds the difference of two inputs | |
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Capacitor C1, which is temporarily grounded at its upper node, Pin 9 of IC1, tracks the VINB voltage. Marián Štofka, Slovak University of Technology, Bratislava, Slovakia | |
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The basis for the operation of this circuit is the simultaneous tracking of the VINA and VINB input voltages on capacitors C1 and C2 and a stacking of these capacitors within the sample interval on capacitor C3... Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 28 July 2008
| Detector Circuit Diagram - Precision capacitive-sensor interface for miniature instruments | |
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The square-wave output from a low-voltage 555 timer, IC1, constantly triggers the precision one-shot, IC2, to produce quasistable outputs for time periods T1 and T2, which are proportional to external timing capacitance Jiaqi Shen and Xiaoshu Cai, University of Shanghai for Science and Technology, Shanghai, China |
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A pair of one-shots develops a voltage proportional to the value of a capacitive sensor and transmits these readings via a LVDS interface. In some applications of capacitive sensors, the instrument's front end must be small enough to fit into a narrow space... Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 10 July 2008
| Power Circuit Diagram - Touch-activated timer switch extends battery life | |
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When you momentarily touch both C and D with bare fingers, current through your hand charges C1 to the threshold level of Q2. Israel Schleicher, Prescott Valley, AZ | |
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This Design Idea describes two distinct implementations of a touch-activated timer switch that you can add to many battery-operated gadgets that you might inadvertently leave on... Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 10 July 2008
| Power Circuit Diagram - Tester cycles system-power supplies | |
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When transistor Q2 turns on, it provides a low-resistance path for the coil of S2 and thus energizes the relay, causing S2's contact, 2B, to close. Goh Ban Hok, Infineon Technologies Asia Pacific Ltd, Singapore | |
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This Design Idea describes a simple and inexpensive power-cycle circuit using just a few components (Figure 1). The power-supply input voltage is a dc supply from an inexpensive switching-power-supply adapter... Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 10 July 2008
| Power Circuit Diagram - Low-cost circuit incorporates mixing and amplifying functions | |
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Two resistors in the feedback loop set the voltage conversion gain for this circuit, which integrates the mixer function with a noninverting amplifier, for frequency-conversion. By Guus Colman, Guy Torfs, Johan Bauwelinck, and Jan Vandewege, INTEC/IMEC | |
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The circuit uses an Analog Devices low-cost, 300-MHz, rail-to-rail AD8063 amplifier. The test circuit comprises a noninverting-op-amp circuit, which drives a load of 4 kO. In the test circuit, the voltage gain is 20 dB. However, you must consider the switching loss, which is about 10 dB when using an ideal switch and a 50%-duty-cycle clock. This scenario results in a 10-dB voltage-conversion gain... Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
Posted: 10 July 2008
| Alarm Circuit Diagram - Simple blown-fuse indicator sounds an alarm | |
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The 1-kO resistor forward biases D2 and Q1's base-emitter junction, forcing the buzzer to sound at a low frequency equal to the flashing frequency of D2. By Vladimir Oleynik, Moscow, Russia | |
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The circuit signals that a fuse has blown. Input voltage ranges from 4 to 30V dc. The input range of the 78L05 voltage regulator determines the high limit; the lower one is less than the input range of the voltage regulator, but 4V dc is sufficient for the indicator to operate... Read the full Circuit Design Idea * Could this Circuit be improved? email circuits@electronicsweekly.com | |
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