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/2011/09/15/voltage-controlled-gain-video-amplifier/ http://www.simplecircuitdiagram.com/2011/09/15/voltage-controlled-gain-video-amplifier/#comments Thu, 15 Sep 2011 04:59:42 +0000 Rust http://www.simplecircuitdiagram.com/?p=2691 Gain adjustment will be more flexible if it controlled by a voltage signal, since we can use many methods to provide user interface. We can control it by a potentiometer with anti glitch filter, or we can drive it with … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/09/15/voltage-controlled-gain-video-amplifier/feed/ 0 http://www.simplecircuitdiagram.com/2011/07/10/magnetic-phono-cartridges-transistor-riaa-preamp/ http://www.simplecircuitdiagram.com/2011/07/10/magnetic-phono-cartridges-transistor-riaa-preamp/#comments Sun, 10 Jul 2011 14:24:06 +0000 Rust http://www.simplecircuitdiagram.com/?p=2646 The following two-transistor circuit is a pre-amplifier circuit for magnetic phono cartridge, which is characterized by its frequency response defined by RIAA standard for phono recording. This pre amp circuit  has gain around 40 dB (midband) at 1 kHz. Here … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/07/10/magnetic-phono-cartridges-transistor-riaa-preamp/feed/ 0 http://www.simplecircuitdiagram.com/2011/01/31/mic-pre-amp-with-clipping/ http://www.simplecircuitdiagram.com/2011/01/31/mic-pre-amp-with-clipping/#comments Mon, 31 Jan 2011 06:24:51 +0000 Rust http://www.simplecircuitdiagram.com/?p=2238 Signal clipping is usually avoided in most application, but we can find some useful examples where clipping is intentionally employed in audio processing. One example is signal limiter in SSB or radio transmission.  In radio communication, the source of modulating … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/01/31/mic-pre-amp-with-clipping/feed/ 0 http://www.simplecircuitdiagram.com/2010/12/31/magnetic-phono-preamp-has-ultra-low-noise-figure/ http://www.simplecircuitdiagram.com/2010/12/31/magnetic-phono-preamp-has-ultra-low-noise-figure/#comments Fri, 31 Dec 2010 01:47:05 +0000 Rend http://www.simplecircuitdiagram.com/?p=2251 This circuit is a ultra low noise magnetic phono preamp. This circuit uses an LM381/1A. This circuit also includes RIAA equalization. This circuit has ultra low noise. The DC voltage level at the output of this circuit is about 16.5V, … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/12/31/magnetic-phono-preamp-has-ultra-low-noise-figure/feed/ 0 http://www.simplecircuitdiagram.com/2010/12/20/fet-hydrophone-pre-amplifier/ http://www.simplecircuitdiagram.com/2010/12/20/fet-hydrophone-pre-amplifier/#comments Mon, 20 Dec 2010 03:44:13 +0000 Rust http://www.simplecircuitdiagram.com/?p=2170 Unwanted noise is eliminated by FET. FET also added capacitance caused by long cobias connecting hydrophone to shore station. Voltage gain is unity. Hydrophone preamp can be used with cables up to 3000 feet long. Use 1 Meg resistor between … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/12/20/fet-hydrophone-pre-amplifier/feed/ 0 http://www.simplecircuitdiagram.com/2010/12/06/basic-audio-mixer-using-op-amp/ http://www.simplecircuitdiagram.com/2010/12/06/basic-audio-mixer-using-op-amp/#comments Mon, 06 Dec 2010 02:23:48 +0000 Rust http://www.simplecircuitdiagram.com/?p=2093 Audio mixer is used to mix several audio signal from many channel into one channel, in analog form. The basic requirement of an audio mixer is that the mixed signal is a product of simple addition. When connected to several … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/12/06/basic-audio-mixer-using-op-amp/feed/ 0 http://www.simplecircuitdiagram.com/2010/12/05/basic-fet-amplifier/ http://www.simplecircuitdiagram.com/2010/12/05/basic-fet-amplifier/#comments Sun, 05 Dec 2010 09:19:00 +0000 Rend http://www.simplecircuitdiagram.com/?p=2079 This is The Fet Amplifier circuit. This circuit uses FET transistor. The gate of the FET must be negative with respect to the source, so a bias can be achieved in the following manner. The voltage that is across the … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/12/05/basic-fet-amplifier/feed/ 0 http://www.simplecircuitdiagram.com/2010/12/03/directly-coupled-transistor-amplifier/ http://www.simplecircuitdiagram.com/2010/12/03/directly-coupled-transistor-amplifier/#comments Fri, 03 Dec 2010 02:08:37 +0000 Rend http://www.simplecircuitdiagram.com/?p=2058 This is a The Directly (DC) Coupled Amplifier circuit. This circuit is built from NPN transistor and PNP transistor. This circuit is used to amplify a DC signal. Since there is no coupling capacitor to block DC, this circuit can … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/12/03/directly-coupled-transistor-amplifier/feed/ 0 http://www.simplecircuitdiagram.com/2010/12/03/transistor-common-base-amplifier/ http://www.simplecircuitdiagram.com/2010/12/03/transistor-common-base-amplifier/#comments Fri, 03 Dec 2010 01:44:25 +0000 Rust http://www.simplecircuitdiagram.com/?p=2049 As far as AC is concerned, the base is connected to the ground by the C3. Therefore, both input and output are connected to the base (common base amplifier). The magnitude of the current gain is less than 1 since … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/12/03/transistor-common-base-amplifier/feed/ 0 http://www.simplecircuitdiagram.com/2010/11/20/npn-transistor-darlington-configuration/ http://www.simplecircuitdiagram.com/2010/11/20/npn-transistor-darlington-configuration/#comments Sat, 20 Nov 2010 03:36:41 +0000 Rust http://www.simplecircuitdiagram.com/?p=1966 In the Darlington configuration, this emitter follower has a pair of transistors. The emitter current of one transistor becomes the base current of the second in this arrangement. The Darlington configuration acts like one transistor with a beta which is … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/11/20/npn-transistor-darlington-configuration/feed/ 0