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  • Positive-input-negative-output-charge-pump

    2017-09-05 23:51:5966

    A charge pump is a simple means of generating a low-power voltage supply of opposite polarity from the main supply. The 74Cl4 IC is a self-oscillating ...

  • Nearly-50-percent-duty-cycle-multlvibrator

    2017-09-05 23:00:1762

    Three factors contribute to the output symmetry. The capacitor charges and discharges through the same external resistor. An internal resistive divider...

  • Air-motion-detector

    2017-09-05 22:53:0363

    When a current of air hits tbe piezo element, a small signal is generated and is fed through Cl and Rl to inverting input pin 2 of one section of the L...

  • Monostable-operation

    2017-09-05 22:19:5061

    In this mode, the timer functions as a one shot. The external capacitor is initially held discharged by a transistor internal to the timer. Applying a ...

  • Tape recorder interface

    2017-09-05 21:47:2363

    The interface allows data to be saved on an ordinary tape recorder at a speed of 2400 bit/s. The serial stream of data Fig. 1 (A) is coded with a clock...

  • Op Amp Regulator

    2017-09-05 21:37:4862

    This op amp offers a straightforward method of developing a single-polarity stable voltage source (see the figure). TVansi stor Ql gets a base drive th...

  • Pulse sequence detector

    2017-09-05 21:17:4864

    The resistor divider connected between Ql and Q2 supplies IH to Ql after input A triggers it. It also prevents input from triggering Q2 until Ql conduc...

  • Electronic keyer

    2017-09-05 19:37:1763

    This circuit automatically produces Morse code dots and dashes set by time constants involving Cl and C2. Rl sets dot/dash ratio and R2 sets the speed ...

  • Gasfet Frequency Doubler

    2017-09-05 19:20:5063

    This circuit will produce over 10 dBm in the 1800-3 000-MHz range. Drive power is 7 dBm in the 900-to-l 500-MHz r ange. The PC board is G-10 Epoxy doub...

  • two-tone generator

    2017-09-05 19:19:3961

    Two 741 operational amplifiers are used for the active element in this Wien bridge oscillator. (The 1458 is the dual version of the 741.) Frequencies o...

  • Sun wake-up call

    2017-09-05 19:17:5562

    A cadmium sulfide photocell (LDR1, which is a light-dependent resistor) is connected to the base and collector of an npn transistor, Ql. When light hit...

  • DM74LS47N BCD to 7-Segment Decoder/Driver with Open-Collecto

    2017-09-05 17:22:4561

    The DM74LS47N accepts four lines of BCD (8421) input data, generates their complements internally and decodes the data with seven AND/OR gates having o...

  • Windicator

    2017-09-05 17:09:2361

    Two TTL ICs and a handful of other components are all that is needed for a circuit that will indicate which of four buttons was pressed first, as well ...

  • Color organ

    2017-09-05 16:56:4664

    Three lights are controlled by the three channels. One light will pulse in response to the bass, another illuminates with mid-range sounds, and the las...

  • Null detector

    2017-09-05 16:47:1065

    Null detector uses simple LED readout to indicate if test resistor R* is below, equal to, or greater than test resistance Rref. IfR* = Rref, the 741 ou...

  • Vco Circuit Circuit

    2017-09-05 16:40:1460

    The output frequency of this simple low-cost active voltage-controlled oscillator circuit is based upon the inherent frequency dependent characteristic...

  • Resettable Shutdown circuits

    2017-09-05 16:39:0760

    If your circuits experience frequency overvoltage conditions, continually replacing blown fuses can get pretty expensive. However, this shutdown circui...

  • 50Ohm transmission line driver

    2017-09-05 14:56:4960

    This circuit uses a wideband, high slew rate CA3100 BiMOS.op amp. The slew rate for this amplifier is 28 V//as. Output swing is 9 volts peak-to-peak in...

  • Hi-Low level comparator

    2017-09-05 14:56:4761

    The voltage to be compared is fed through diode Dl and D2 to the voltage dividers Rl and R5 where the low and high limits are present. When the voltage...

  • Vhf-Uhf Preamp Circuit

    2017-09-05 14:50:5261

    The MAR-x preamp shown will cover up to 1.5 or 2 GHz with the correct MAR-x IC. ATTN1 should be omitted for low noise-figure.appli cations. ATTN1 and A...

  • Compound Op Amp Vco Driver

    2017-09-05 14:13:2660

    This circuit produces 5- to 25-V output to drive a VCO from a standard ?± 15-V supply system. R7 and CI supply fr equency compensation. Ql through Q3 ...

  • Ionization chamber smoke detector II

    2017-09-05 13:39:1660

    The smoke alarm signal must be a continuous one rather than pulsating, then the slightly less expensive all discrete transistor version of the MC14572 ...

  • 50Mhz-trigger

    2017-09-05 13:01:0760

    This has a stable trigger 100 m V sensitivity at 50 MHz. The FETs comprise a simple high-speed buffer and the LT1016 compares the buffer`s output to th...

  • Stimulus-isolator

    2017-09-05 12:53:1160

    This stimulus isolator uses a photo-SCR and a toroid for shaping pulses of up to 200 V at 200 p.A. The circuit. Reprinted Url Of This Article: http://w...

  • Double-ended limit detector

    2017-09-05 12:40:5261

    Detector uses three sections of an L144 and a CMOS NAND gate to make a very low power voltage monitor. The 1 MO resistors Rl, R2, R3, and R4 translate ...

  • 4 Channel ASK remote with HT12E & HT12D chips

    2017-09-05 12:37:1762

    This ASK based remote control using very popular encoder-decoder chips HT12E HT12D. These chips are widely used for remote control applications. Specia...

  • Product detector

    2017-09-05 12:14:1862

    The MC1596/MC1496 makes an excellent SSB product detector. This product detector has a sensitivity of 3 microvolts and a dynamic range of 90 dB when op...

  • Low Noise And Drift Composite Amp Circuit

    2017-09-05 12:00:4860

    This circuit offers the best of both worlds. It can be combined with a low input offset voltage and drift without degrading the overall system`s dynami...

  • Transmission indicator

    2017-09-05 11:14:3960

    Everytime the push-to-talk button is closed the light will go on. The antenna samples the output RF from the transmitter. That signal is then rectified...

  • Frequency comparator circuit

    2017-09-05 10:26:0160

    Input 1 is used as a gating period, during which a single rising edge on input 2 will cause a logic 1 output-any other number, indicating non-identical...

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