http://www.simplecircuitdiagram.com Free Simple Circuit Diagram Mon, 06 Feb 2012 04:23:39 +0000 en hourly 1 http://wordpress.org/?v=abc 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/2011/02/17/general-purpose-af-amplifier/ http://www.simplecircuitdiagram.com/2011/02/17/general-purpose-af-amplifier/#comments Thu, 17 Feb 2011 03:01:15 +0000 Rend http://www.simplecircuitdiagram.com/?p=2377 This is a schematic diagram of general-purpose audio frequency (AF) amplifier circuit. This circuit uses cheap 1/4-W  resistors, no high precision needed so 5%-tolerance of carbon or metal film units is good enough. This circuit has frequency response range from … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/02/17/general-purpose-af-amplifier/feed/ 0 http://www.simplecircuitdiagram.com/2010/12/15/lm1875-20-watt-audio-power-amplifier/ http://www.simplecircuitdiagram.com/2010/12/15/lm1875-20-watt-audio-power-amplifier/#comments Wed, 15 Dec 2010 02:54:51 +0000 Rust http://www.simplecircuitdiagram.com/?p=2120 With LM1875, we can build a low cost but high performance audio power amplifier. With 50V power supply, it can produce 20W output power for 4 or 8 ohm speaker. We can even get 30W output if we use 60V … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/12/15/lm1875-20-watt-audio-power-amplifier/feed/ 0 http://www.simplecircuitdiagram.com/2010/12/03/transistor-push-pull-power-amplifier/ http://www.simplecircuitdiagram.com/2010/12/03/transistor-push-pull-power-amplifier/#comments Fri, 03 Dec 2010 01:57:47 +0000 Rend http://www.simplecircuitdiagram.com/?p=2059 This is a The Push Pull Power Amplifier circuit. This circuit is a class B push pull amplifier. When there is no signal input, the TR3 and TR2 are not conducting. If there is no signal input, this circuit draw … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/12/03/transistor-push-pull-power-amplifier/feed/ 0 http://www.simplecircuitdiagram.com/2010/12/03/transistor-class-a-power-amplifier/ http://www.simplecircuitdiagram.com/2010/12/03/transistor-class-a-power-amplifier/#comments Fri, 03 Dec 2010 01:36:06 +0000 Rust http://www.simplecircuitdiagram.com/?p=2046 The transistor is biased in class A. That’s mean the collector current flows all the time. This current can increase or decrease,  caused by the input signal which increases and decreases the forward bias. This increasing or decreasing depends on … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/12/03/transistor-class-a-power-amplifier/feed/ 0 http://www.simplecircuitdiagram.com/2010/06/24/small-amplifier-using-transistors/ http://www.simplecircuitdiagram.com/2010/06/24/small-amplifier-using-transistors/#comments Thu, 24 Jun 2010 01:31:54 +0000 Rust http://www.simplecircuitdiagram.com/?p=1229 The output of this circuit is push-pull and consumes less than 3mA (with no signal) but drives the earpiece to a very loud level when audio is detected. Because the whole circuit is Dc coupled, its extremely difficult to set … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/06/24/small-amplifier-using-transistors/feed/ 0 http://www.simplecircuitdiagram.com/2010/06/12/electronic-ear/ http://www.simplecircuitdiagram.com/2010/06/12/electronic-ear/#comments Sat, 12 Jun 2010 00:43:27 +0000 Rust http://www.simplecircuitdiagram.com/?p=1207 Circuit below is a very sensitive 3-transistor amplifier using a speaker transformer. This can be wound on a short length of ferrite rod as show above or 150 turns on a 10mH choke. The biasing of the middle transistor is … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/06/12/electronic-ear/feed/ 0 http://www.simplecircuitdiagram.com/2010/03/24/tda8932b33b-class-d-audio-amplifier-in-symmetric-supply-single-ended-configuration/ http://www.simplecircuitdiagram.com/2010/03/24/tda8932b33b-class-d-audio-amplifier-in-symmetric-supply-single-ended-configuration/#comments Wed, 24 Mar 2010 16:31:21 +0000 Rust http://www.simplecircuitdiagram.com/?p=815 We can also operate TDA8932B/33(B) from a symmetrical supply. On this diagram, three half supply voltage buffers are disabled. When supplied from a symmetrical supply, HVPREF (Pin 11), HVP1 (pin 30) and HVP2 (Pin 19) should be connected to ground. … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/03/24/tda8932b33b-class-d-audio-amplifier-in-symmetric-supply-single-ended-configuration/feed/ 0 http://www.simplecircuitdiagram.com/2010/03/23/tda8932b33b-class-d-audio-amplifier-in-single-supply-single-ended-configuration/ http://www.simplecircuitdiagram.com/2010/03/23/tda8932b33b-class-d-audio-amplifier-in-single-supply-single-ended-configuration/#comments Tue, 23 Mar 2010 15:43:18 +0000 Rust http://www.simplecircuitdiagram.com/?p=812 The following circuit diagram is a simplified application circuit of the TDA8932B/33(B) device when operated from an asymmetrical supply (single supply). Here’s the circuit diagram: To simplify the design for an asymmetrical supply in SE configuration, the TDA8932B/33(B) is equipped … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/03/23/tda8932b33b-class-d-audio-amplifier-in-single-supply-single-ended-configuration/feed/ 0 http://www.simplecircuitdiagram.com/2010/01/08/small-discrete-audio-power-amplifier/ http://www.simplecircuitdiagram.com/2010/01/08/small-discrete-audio-power-amplifier/#comments Fri, 08 Jan 2010 01:03:35 +0000 Adam http://www.simplecircuitdiagram.com/?p=402 This is a little audio amplifier, it is similar to the audio amplifier which is used in small transistor radio. This circuit draws about 30 milliamps from a 9 volt supply. This circuit consist of two stage. First stage is … Continue reading →]]> http://www.simplecircuitdiagram.com/2010/01/08/small-discrete-audio-power-amplifier/feed/ 0