http://www.simplecircuitdiagram.com Free Simple Circuit Diagram Tue, 24 Jan 2012 02:31:05 +0000 en hourly 1 http://wordpress.org/?v=abc http://www.simplecircuitdiagram.com/2012/01/24/general-infrared-remote-controlled-relay/ http://www.simplecircuitdiagram.com/2012/01/24/general-infrared-remote-controlled-relay/#comments Tue, 24 Jan 2012 02:31:05 +0000 Rend http://www.simplecircuitdiagram.com/?p=2752 This relay circuit is controlled by almost any type of infrared remote controller. This circuit works on assumption that almost all remote controller use high frequency modulated infrared light. By filtering out un-modulated or low frequency modulated signal, this circuit … Continue reading →]]> http://www.simplecircuitdiagram.com/2012/01/24/general-infrared-remote-controlled-relay/feed/ 0 http://www.simplecircuitdiagram.com/2012/01/11/simple-ir-remote-tester/ http://www.simplecircuitdiagram.com/2012/01/11/simple-ir-remote-tester/#comments Wed, 11 Jan 2012 02:20:43 +0000 Rust http://www.simplecircuitdiagram.com/?p=2743 The most common problem for infra-red (IR) remote control is the failure to transmit the pulsed infra-red light. The circuit shown in the schematic diagram below is an IR remote control handset tester. This device is very useful and easy … Continue reading →]]> http://www.simplecircuitdiagram.com/2012/01/11/simple-ir-remote-tester/feed/ 0 http://www.simplecircuitdiagram.com/2012/01/02/frequency-modulated-oscillator-for-fm-transmitter/ http://www.simplecircuitdiagram.com/2012/01/02/frequency-modulated-oscillator-for-fm-transmitter/#comments Mon, 02 Jan 2012 00:18:47 +0000 Rust http://www.simplecircuitdiagram.com/?p=2740 An oscillator can be built using LC (inductor-capacitor) tank circuit. When we vary the capacity of the capacitor in LC tank circuit then the frequency of the oscillator will vary according to capacitance change.  The idea of this modulator is … Continue reading →]]> http://www.simplecircuitdiagram.com/2012/01/02/frequency-modulated-oscillator-for-fm-transmitter/feed/ 0 http://www.simplecircuitdiagram.com/2011/12/20/heart-monitor-ecg-sensor-signal-amplifierconditioner/ http://www.simplecircuitdiagram.com/2011/12/20/heart-monitor-ecg-sensor-signal-amplifierconditioner/#comments Tue, 20 Dec 2011 20:16:02 +0000 Rend http://www.simplecircuitdiagram.com/?p=2724 Using the circuit depicted in the schematic diagram below we can monitor the heart pulses of patient. This circuit buffer and amplify the heart pulses, and the amplification bandwidth ranges from DC to 3 kHz. For the core of the … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/12/20/heart-monitor-ecg-sensor-signal-amplifierconditioner/feed/ 0 http://www.simplecircuitdiagram.com/2011/12/09/lm139-one-shot-multivibrator/ http://www.simplecircuitdiagram.com/2011/12/09/lm139-one-shot-multivibrator/#comments Fri, 09 Dec 2011 23:18:28 +0000 Rend http://www.simplecircuitdiagram.com/?p=2725 The circuit below is a one-shot multivibrator. One shot multivibrator is also known as monostable multivibrator, or timer. The main function of such circuit is producing a fixed width pulse. The width of this pulse is determined by the component … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/12/09/lm139-one-shot-multivibrator/feed/ 0 http://www.simplecircuitdiagram.com/2011/12/02/ears-and-speakers-protector/ http://www.simplecircuitdiagram.com/2011/12/02/ears-and-speakers-protector/#comments Fri, 02 Dec 2011 19:06:24 +0000 Rend http://www.simplecircuitdiagram.com/?p=2726 Sometimes the output volume of amplifier is too high and hurts our ears. As well as hurting your ears, this incident could damage your loudspeaker. The circuit below can be used to protect both our ears and our loudspeakers from … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/12/02/ears-and-speakers-protector/feed/ 0 http://www.simplecircuitdiagram.com/2011/11/21/digital-ph-meter-signal-conditioner/ http://www.simplecircuitdiagram.com/2011/11/21/digital-ph-meter-signal-conditioner/#comments Mon, 21 Nov 2011 11:41:01 +0000 Rust http://www.simplecircuitdiagram.com/?p=2761 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 when submersed in the measured solution, producing a weak voltage … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/11/21/digital-ph-meter-signal-conditioner/feed/ 0 http://www.simplecircuitdiagram.com/2011/11/13/solid-state-555-ic-stroboscope/ http://www.simplecircuitdiagram.com/2011/11/13/solid-state-555-ic-stroboscope/#comments Sun, 13 Nov 2011 04:55:05 +0000 Rend http://www.simplecircuitdiagram.com/?p=2727 Stroboscope is used to measure the speed of rotation, using the effect of strobed light, where a moving object will be perceived as stationary object if the light is strobed fast enough relative to the movement speed. When applied to … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/11/13/solid-state-555-ic-stroboscope/feed/ 0 http://www.simplecircuitdiagram.com/2011/11/07/delayed-car-door-alarm/ http://www.simplecircuitdiagram.com/2011/11/07/delayed-car-door-alarm/#comments Mon, 07 Nov 2011 03:32:03 +0000 Rust http://www.simplecircuitdiagram.com/?p=2719 Opening car’s door is very simple activity, and off course it’s just a daily activity which require no special skill. Almost nothing can go wrong, but forgetting to close the door when we doing or thinking on many tasks is … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/11/07/delayed-car-door-alarm/feed/ 0 http://www.simplecircuitdiagram.com/2011/10/28/voltage-to-frequency-converter-using-ujt/ http://www.simplecircuitdiagram.com/2011/10/28/voltage-to-frequency-converter-using-ujt/#comments Fri, 28 Oct 2011 12:08:50 +0000 Rust http://www.simplecircuitdiagram.com/?p=2713 The following voltage to frequency converter (V/FC – VCO) circuit consist of a UJT (uni-junction transistor) oscillator in which the timing charge capacitor C2 is linearly depends on the input signal voltage. The voltage across resistor R5 set the charging … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/10/28/voltage-to-frequency-converter-using-ujt/feed/ 0