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/2011/05/23/50-khz-fm-optical-receiver/ http://www.simplecircuitdiagram.com/2011/05/23/50-khz-fm-optical-receiver/#comments Mon, 23 May 2011 01:13:19 +0000 Rust http://www.simplecircuitdiagram.com/?p=2593 Frequency modulation (FM) can be used to transmit analog voltage level signal with good noise immunity. The transmission itself  might employs different methods, and this circuit uses free air optical medium. This optical receiver circuit is built using a L14G2 … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/05/23/50-khz-fm-optical-receiver/feed/ 0 http://www.simplecircuitdiagram.com/2011/05/11/lm331-frequency-to-voltage-converter/ http://www.simplecircuitdiagram.com/2011/05/11/lm331-frequency-to-voltage-converter/#comments Wed, 11 May 2011 13:46:24 +0000 Rust http://www.simplecircuitdiagram.com/?p=2575 The frequency to voltage converter circuit illustrated in the schematic diagram below produces a 10 V output for 10 kHz full scale input (square waves or pulses).  The simplicity of the circuit doesn’t mean a bad performance: this circuit has … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/05/11/lm331-frequency-to-voltage-converter/feed/ 0 http://www.simplecircuitdiagram.com/2010/12/12/xr2211-linear-fm-detector/ http://www.simplecircuitdiagram.com/2010/12/12/xr2211-linear-fm-detector/#comments Sun, 12 Dec 2010 23:21:10 +0000 Rend http://www.simplecircuitdiagram.com/?p=2151 This is a linear FM detector circuit. This circuit usually is used in telemetry applications and wide range of analog communications. The main part of this circuit is a XR-2211. This circuit has an external buffer/amplifier that is needed due … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/12/12/xr2211-linear-fm-detector/feed/ 0 http://www.simplecircuitdiagram.com/2010/11/11/square-law-am-detector-demodulator/ http://www.simplecircuitdiagram.com/2010/11/11/square-law-am-detector-demodulator/#comments Thu, 11 Nov 2010 04:30:07 +0000 Rust http://www.simplecircuitdiagram.com/?p=1816 Below is figure of a transistor square-law detector. At a low quiescent collector current (95 uA), it biased to operate so the output will be significantly nonlinear. To test the circuit, we can feed base with a 550 kHz RF … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/11/11/square-law-am-detector-demodulator/feed/ 0 http://www.simplecircuitdiagram.com/2010/11/10/linear-detector-for-am-demodulation/ http://www.simplecircuitdiagram.com/2010/11/10/linear-detector-for-am-demodulation/#comments Wed, 10 Nov 2010 03:17:53 +0000 Rust http://www.simplecircuitdiagram.com/?p=1819 We can simply a rectifier using a linear detector. It’s not only have no gain, but also no distortion. An example from two op-amps is the easy one as shown in the following circuit diagram. The second op-amp is a … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/11/10/linear-detector-for-am-demodulation/feed/ 0 http://www.simplecircuitdiagram.com/2010/11/10/ratio-detector-for-fm-demodulation/ http://www.simplecircuitdiagram.com/2010/11/10/ratio-detector-for-fm-demodulation/#comments Wed, 10 Nov 2010 03:09:36 +0000 Rust http://www.simplecircuitdiagram.com/?p=1822 This view is not far from wrong because the operation of FM detectors is widely regarded as mysterious. The ratio detector to find out how it works, without going deeply into the theory at this point, or studying other forms … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/11/10/ratio-detector-for-fm-demodulation/feed/ 0 http://www.simplecircuitdiagram.com/2009/11/16/pll-fm-demodulator/ http://www.simplecircuitdiagram.com/2009/11/16/pll-fm-demodulator/#comments Mon, 16 Nov 2009 07:22:24 +0000 Adam http://www.simplecircuitdiagram.com/?p=162 PLL (Phase Locked Loop) can be used to make a FM demodulator. PLL circuit track the input frequency by controlling a voltage input of a VCO (Voltage-Controlled Oscillator). Since the VCO is controlled to follow the input frequency, then the … Continue reading →]]> http://www.simplecircuitdiagram.com/2009/11/16/pll-fm-demodulator/feed/ 0