Inside Circuits

Water Softener Circuit

Water Softener Circuit

That circuit is based at a technique to remove or neutralize the salt in water, and protect the pipes at home as well as the washing machines or our selves from salt. Its called water softener and its automated circuit using two 555 timers. ..

TBA820 Amplifier

TBA820 Amplifier

A very useful audio amp in an 8-pin DIL package. The IC features a very low minimum working supply voltage of 3V, low quiescent current, good ripple rejection, no crossover distortion and low power dissipation...

1W stereo Headphone Amp (TDA2822)

1W stereo Headphone Amp (TDA2822)

A stereo power amp designed for use in portable players and radios. A 3V supply can be used to drive headphones providing 20mW in 32 Ohms per channel. ..

Low Power Amplifier LM386

Low Power Amplifier LM386

A power amp designed for use in low voltage, especially battery-operated, applications. For minimum parts count, C1 and C2 can be omitted. ..

8 Watts Audio Amplifier (TDA2003)

8 Watts Audio Amplifier (TDA2003)

Nice small audio amplifier which use only few parts to give good quality sound. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp. Although not perfect, this amplifier does have a wide frequency response, low harmonic distortion about 1.5%, and is capable of driving an 8 ohm speaker to output levels of around 8 watts with slightly higher distortion. ..

1W Linear FM Booster

1W Linear FM Booster

That RF Amplifier is for boosting small fm transmitters and bugs. It use two Philips 2N4427 and its power is about 1Watt. At the output you can drive any linear with BGY133 or BLY87 and so on. Its power supply has to give 500mA current at 12 Volts. More voltage can boost the distance but the transistors will be burned much earlier than usual.! In any case do not exceed the 15Volts. ..

Low Noise Moving Coil Audio Preamplifier

Low Noise Moving Coil Audio Preamplifier

This preamplifier was designed for low resistance sources like moving coil heads (MC). The circuit uses in parallel three duble transistors SSM2220 or MAT03 and by forming a diferential amplifier keeps noice low. Connecting this amplifier in front of a OP27 amp we gain even lower noise. Also the reason we use PNP rather NPN transistors is because they have les low frequency noice. ..

High Quality Valve Amplifier

High Quality Valve Amplifier

In recent years more and more, have a tendency ket demanded higher reimbursement structures with lights and music lovers in general and manufacturers of tube amplifiers. The reason, in their view is that the sound of tubes is more sweet, how rich and incomparably cleaner, On the other hand, however, the entire structure is much more massive than transistor amplifiers, considerably more expensive, while the operation voltages are very high that require special protection measures to prevent identity risk of electric shock. The tube structures as key components require fine-tuning, otherwise liable to break. The lights generally resistant but excellent work at very high temperatures without having the need for heatsinks. They just need ventilation. The lifetime of the bulbs is probably less than that of a transistor but it does warn the iote be burned as opposed to transistor destruction is sudden...

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