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/2011/12/02/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/2011/10/01/fuzz-box-distortion-pedal-guitar-effect/ http://www.simplecircuitdiagram.com/2011/10/01/fuzz-box-distortion-pedal-guitar-effect/#comments Sat, 01 Oct 2011 12:12:23 +0000 Rend http://www.simplecircuitdiagram.com/?p=2701 This guitar effect circuit uses a simple high gain amplification, followed by a symmetric clipping using parallel diodes clipper. The gain of the 741 op-amp pre amplifier will be R3/(total impedance of guitar pickup + C1).  With 1 kOhm guitar … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/10/01/fuzz-box-distortion-pedal-guitar-effect/feed/ 0 http://www.simplecircuitdiagram.com/2011/09/05/audio-powered-tape-recorder-switching-controller/ http://www.simplecircuitdiagram.com/2011/09/05/audio-powered-tape-recorder-switching-controller/#comments Mon, 05 Sep 2011 04:47:47 +0000 Rust http://www.simplecircuitdiagram.com/?p=2688 When the source of the sound is only intermittently exist, it’s better to turn on the tape recording only when it really present.  We can control a tape recorder to switch a tape recorder on when audio is present by … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/09/05/audio-powered-tape-recorder-switching-controller/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/2011/04/21/high-impedance-input-hi-fi-tone-control/ http://www.simplecircuitdiagram.com/2011/04/21/high-impedance-input-hi-fi-tone-control/#comments Thu, 21 Apr 2011 11:42:43 +0000 Rend http://www.simplecircuitdiagram.com/?p=2538 Tone control circuit is an electronic circuit which is designed to manipulate the tone of audio signal. Tone of audio signal is analog to color in light. We don’t call the tone of audio signal as red, green or or … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/04/21/high-impedance-input-hi-fi-tone-control/feed/ 0 http://www.simplecircuitdiagram.com/2011/04/19/simple-door-intercom/ http://www.simplecircuitdiagram.com/2011/04/19/simple-door-intercom/#comments Tue, 19 Apr 2011 02:41:13 +0000 Rend http://www.simplecircuitdiagram.com/?p=2519 This intercom circuit suitable for accompanying  door bell. This circuit uses the speakers both as microphones and as loudspeaker. This intercom is made simple by using only a single amplifier IC LM390 to serve two-way communication. This circuit is based … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/04/19/simple-door-intercom/feed/ 0 http://www.simplecircuitdiagram.com/2011/03/13/high-q-notch-filter-with-active-twin-t-network/ http://www.simplecircuitdiagram.com/2011/03/13/high-q-notch-filter-with-active-twin-t-network/#comments Sun, 13 Mar 2011 23:36:19 +0000 Rend http://www.simplecircuitdiagram.com/?p=2447 This is a circuit of High-Q Notch Filter. This circuit consist of LM102 and a twin “T” network. Twin T network sum two signal from different path with different phase shift. At certain frequency, the phase shift will be 180 … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/03/13/high-q-notch-filter-with-active-twin-t-network/feed/ 0 http://www.simplecircuitdiagram.com/2011/03/05/vox-voice-operated-switch/ http://www.simplecircuitdiagram.com/2011/03/05/vox-voice-operated-switch/#comments Sat, 05 Mar 2011 02:30:01 +0000 Rend http://www.simplecircuitdiagram.com/?p=2429 This schematic diagram below show a circuit of VOX Box (voice-operated switch). This circuit consist of a Schmitt trigger, a relay driver, and microphone preamplifier. The microphone preamplifier(U1) receive input signal which will be amplified. THRESHOLD control (R8) is fed … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/03/05/vox-voice-operated-switch/feed/ 0 http://www.simplecircuitdiagram.com/2011/02/19/basic-circuit-makes-rgb-color-organ/ http://www.simplecircuitdiagram.com/2011/02/19/basic-circuit-makes-rgb-color-organ/#comments Sat, 19 Feb 2011 01:43:44 +0000 Rend http://www.simplecircuitdiagram.com/?p=2386 The idea of a color organ is that any sound, including musical sound, can be transformed into light. As stated by wave theory, both music and light have similar properties: frequency. Any note, or combination of notes (chord) can be … Continue reading →]]> http://www.simplecircuitdiagram.com/2011/02/19/basic-circuit-makes-rgb-color-organ/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