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  • Digital gain control of Opamp.

    2015-01-11 20:18:2767

    The gain of U1 can be controlled by a digital binary 1248 nibble at ABC. The gain at digital 000 is unity or 1 and the gain at various stages are set b...

  • Turntable Rumble Filter

    2015-01-11 20:15:20185

    Many record players unfortunately exhibit two undesired side effects: rumble (noise caused by the motor and the turntable) and other low-frequency spur...

  • Programmable Digital Code Lock Schematic Presentation

    2015-01-11 19:37:2967

    This article describes a programmable code lock. The code lock using CMOS integrated circuits and dial the main switch (TWS). It can run in the range b...

  • Digital to Analog with R2R Ladder Network

    2015-01-11 18:49:1769

    This is a R-2R Digital to Analog Converter, It converts a byte (8 bit) to a analog value. It has 256 levels including zero. This can be used to convert...

  • Digital Voice Recorder ISD2560

    2015-01-11 18:49:00117

    Digital Voice Recorder ISD2560 This project is based on ISD2560P IC which allows us to record 60 seconds voice and playback it with very high quality. ...

  • Noisy-signals-filter

    2015-01-11 18:10:0270

    This circuit filters noise, such as glitches and contact bounce, from digital signals. You can easily adjust the circuit for a wide range of noise freq...

  • Digital Signal Processing ??? Applications

    2015-01-11 17:41:0070

    Digital signal processing is the technique used to analyse various digital signals and obtain information form the same. It is also used for transfer o...

  • Digital-fiber-optic-receiver

    2015-01-11 15:47:2886

    This receiver uses the NE5212, the Signetics 10116 ECL line receiver, and the Phillips/Amperex BPF31 pin diode. The circuit is a capacitor-coupled rece...

  • Digital Counter with an Interval of Kilometers

    2015-01-11 15:14:1766

    Figure 1 Part ListThe circuit has been designed for a person who loves to jog or walk while measuring the distance that have been covered during the ac...

  • Digital Pressure Gauge Circuit

    2015-01-11 15:08:51128

    This electronic pressure gauge uses a Wheatstone bridge-type pressure sensor tb drive a 3 A digit A/D converter and a display. IC1 is a pump (quad) tha...

  • Digital pH Meter Signal Conditioner

    2015-01-11 14:56:42158

    A pH meter circuit is basically an amplifier to boost a voltage signal which is produced by a pH probe. The pH probe itself is equal to a battery cell ...

  • Frac Rack Version of Voice of VC Saturn Filter

    2015-01-11 14:55:0875

    A Frac Rack version of our Filter kit is now available: Voice of Saturn Voltage Controlled Filter The VoS Voltage Controlled Filter is based around a C...

  • Dual SPST Analog Switch(LM2575)

    2015-01-11 14:04:19765

    This article describes the Dual SPST Analog Switch (LM2575). The principle is very simple, very practical. The circuit components can help you understa...

  • Digital Delay Unit For Surround Sound (M65830)

    2015-01-11 13:58:3281

    This article describes the Digital Delay Unit For Surround Sound (M65830). The content is very simple, very helpful. Components in this article can hel...

  • Multiplying and Analog Computation

    2015-01-11 13:23:51155

    The Multiplier We have already encountered multiplication of two signals, inAmplitude Modulation and Superheterodynes, where an AM signal is produced b...

  • Pulse generator control frequency by digital IC (CD4066)

    2015-01-11 13:00:25207

    This circuit uses frequency pulse generator, its continuity or Astable Multi Vibrator circuit. By the number 555 is compatible with IC1 VR1, R1, R2, an...

  • Variable High-Pass Filter Circuit

    2015-01-11 12:44:01325

    This second order filter which should prove useful in audio applications uses an LM1458 or other similar of op amp. It is tuneable from 30 to 300 Hz cu...

  • Digital weight scale circuit with IC ADD3701

    2015-01-11 12:27:34238

    Digital weight circuit Welcome back to free circuit dot com,today we are present circuit for digital weight circuit . This uses a potentiometer as the ...

  • Clock Tuned, Highly Selective Notch Filter

    2015-01-11 12:16:4781

    View Full Size Image View Original Application Note This circuit shows a quick, clean way to tune a notch filter’s center frequency by varying a sing...

  • Analog to Digital Converters (A/D)

    2015-01-11 12:04:4973

    This type of converter is used to convert analog voltage to its corresponding digital output. The function of the analog to digital converter is exactl...

  • Digital IC Circuit Schematic Diagram (FGL40N120)

    2015-01-11 11:49:19118

    This article describes the Digital IC Circuit Schematic Diagram (FGL40N120). The content is very simple, very helpful. Components in this article can h...

  • Digital Delay Unit For Surround Sound, Reverb Echo (PT2399)

    2015-01-11 10:54:06106

    This article describes the Digital Delay Unit For Surround Sound, Reverb Echo (PT2399). The content is very simple, very helpful. Components in this ar...

  • Filter Circuits

    2015-01-11 10:34:0583

    Introduction to Filters An electric filter is a network designed to attenuate certain frequencies but pass others without attenuation. A filter circuit...

  • Working of Digital Versatile Disc (DVD)

    2015-01-11 10:05:4769

    Working of DVD What is a DVD? A Digital Versatile Disc/Digital Video Disc [DVD], is an optical disc storage medium like a compact disc [CD], but with g...

  • Fast-Response (Settling) Low-Pass Filter

    2015-01-11 09:40:00223

    By introducing an extra transmission zero to the stopband of a low-pass filter, a sharp roll-off c haracteristic can be obtained. The filter design exa...

  • Digital thermometer with zero adjust

    2015-01-11 09:39:3472

    The ICL8069 brings the input within the common-mode range, while the 5 k ohm pots trim any offset at 218?° (-55?°C), and set the scale factor. This c...

  • First Order Low-Pass Active Filter: The Circuit Schematic Di

    2015-01-11 09:25:26229

    The simple low-pass filter is shown in Figure below. The filter has a 20dB/decade roll-off after its corner frequency fc. Its low-pass frequency gain (...

  • Digital voltmeter (DVM) (LM311N)

    2015-01-11 09:03:4581

    This article describes the Digital voltmeter (DVM) (LM311N). The content is very simple, very helpful. Components in this article can help you understa...

  • Binary Numbers, Boolean Algebra and Digital Design

    2015-01-11 08:42:5879

    Binary Numbers The representation of numbers by the binary digits 0 and 1 in positional notation is an "easy piece," and won't be explained in any deta...

  • Permanent Magnet Motor Control with SCR CIRCUIT (Q4006LH4)

    2015-01-11 08:10:1777

    This article describes the Permanent Magnet Motor Control with SCR CIRCUIT (Q4006LH4). The principle is very simple, very practical. The circuit compon...

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