Electronic Circuits and Diagram-Electronics Projects and Design

Tweeter Crossover Circuit Description A single coil speaker is not good in handling high and low frequency at the same time. If we could filter out the low frequency and play it through a tweeter ,it will produce more sound quality than using a single speaker.This is what is realized here.Here the high frequencies are filtered out using a low pass filter made of C1,C2 and R1 and send to the tweeter.The low frequency is only fed to the woofer. Crossover Circuit Diagram with Parts List Notes The tweeter can be a 2 to 3 inch, 4 to 8 Ohm…

Audio Distortion Meter Description Here is a simple 1KHz audio distortion meter that can measure the Total Harmonic Distortion (THD) on any load at any out put power.Here you have the option to select 2,4,8 or 16 Ohm loads. The circuit works by filtering the 1 kHz fundamental signal using a notch filter comprising of L1,C2,C1,R1. With a little time and calculation you can get the correct THD of your amplifier in such a simple way. Audio Distortion Meter Circuit Diagram with Parts List . Notes Inductor L1 is a UTC VC 15 variable inductor.If this is not available try…

Audio Watt Meter Description This is an easy trick to measure the output of an amplifier.Here resistor R2 acts as the load for for the amp and it should be able to withstand twice the maximum power of the amp you are going to measure.The meter scale must be calibrated and with a little effort you can get good results. Audio Watt meter Circuit Diagram with Parts List. Notes If 1A bridge is not available , make one with four 1N 4007  Diodes. The resistor R2 must be twice the power of amp you are going to measure. To calibrate …

Musical Light Chaser Description Here is a simple state of the art musical chaser circuit that can be used in discotheques or even at home if you are a little music crazy . The working of the circuit is straight forward ,the condenser mic pickup the sound and Q1 amplifies it.This signal is fed to clock input of IC1 ,CD 4016. The IC is wired in divide by ten mode. The out put of IC1 is given to clock input of IC2, CD4016.The out puts of IC 2  shown in the right side of IC2  in circuit diagram will run…

Power Amplifier Circuit – 25 Watts Description Here is the diagram of a 25 Watt power amplifier circuit made of  TDA 2009 IC.TDA 2009 has two channels each rating 12.5 watts on 4 Ohm load.Here the two channels are bridged to get a single out put channel weighting 25 W. TDA 2009 IC has also built in features such as short circuit protection,thermal protection, overload protection etc using very low external components.The most interesting factor I see about this IC is that it require no dual supply. Power Amplifier Circuit Diagram and Power Supply Circuit Schematic   Notes Do not…

This article lists various types of audio amplifier circuits using Mosfet.We have tested all these circuits in our lab and we found all of them performing satisfactorily. Note: This article will be modified with new versions of Mosfet amplifier circuits in future;we shall notify new additions in our home page. This article contains following list of amplifier circuits using Mosfet. List of Circuits 1. 18 Watts Mosfet Amplifier 2. 10 Watt Mosfet Audio Amplifier 3. 50 Watt Mosfet Amplifier Circuit 1. 18 Watts Mosfet Audio Amplifier Description This circuit is an audio amplifier capable of delivering a decent output power…

19 Watts Simple Amplifier Circuit Description This is a 19 watt simple amplifier circuit diagram using IC LA4440 from Sanyo.It uses very less components other than the IC LA4440.A very high quality circuit with respect to its cost and ideal for beginners. Here IC LA 4440 is wired as a bridge amplifier to deliver a 19 W Rms on a 4 Ohm speaker. The IC has built in thermal, over voltage and short circuit protection.The IC also incorporates a audio muting function,but that is not used here. Notes . Use a 12 V DC power supply able to deliver at…

Sound Level Meter Circuit Description This is a one chip sound level meter that can be use for displaying sound level of an amplifier or simply the sound level from a microphone.The heart of the circuit is  IC LM 3915 Audio level IC.Even though it is a stand alone IC , a peak detector based on Transistor BC 558  and diode 1N4001  is also included for better performance. Tips Supply voltage  can be  from 3V to 20V.The input is set for  audio line voltage (1V peak to peak) and has a max  input voltage of 1.3V.   To make the circuit…

Stereo Amplifier Circuit Description Here is the circuit diagram of a  powerful and high quality stereo amplifier using IC TDA 1554.The circuit has only very few components.The circuit works best with a 4 Ohm speaker. TDA1554 is a 4 x 11 watt integrated Class-B audio amplifier from Phillips.Since the IC can be operated from 12V it finds a lot of application in car audio systems.The TDA1554 has a lot of good features like thermal protection, reverse polarity protection, load dump protection, short circuit to ground protection, excellent ripple rejection, no switch ON/OFF thud etc. The IC can be wired in…

Digital Volume Control Circuit Description This is the circuit diagram of a digital volume controller for any sort of audio amplifiers or almost any circuit where a mechanical potentiometer is there(conditions apply). Simple and low cost, the heart of the circuit is DS 1669 digital potentiometer IC from Dallas Semiconductors.The circuit has no external components other than two pushbutton switches and a capacitor. Tips S 1 increases the volume & S2 decreases. The input audio signal must be not less than -0.2 Volts. If some clipping problem occurs, use a dual power supply of +5 & -5V.( Not shown in…