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Archives for November, 2009

Make a simple power amplifier – LM 380

This is Make a simple power amplifier – LM 380. Almost all the components are contained in a single 14 pin package and requiring few external components. The supply voltage can be from about 8 volts to not more than 15 volts. The device is supposed to have internal current limiting and be almost indestructable. […]

Block diagram of a basic synthesiser

Here is the block diagram of a basic synthesiser. The “R-counter” generates the reference frequency. In the MC145152-2 you have about 3 different options. In mine you will have over 2000 different options. The reference frequency can be interpreted as the channel-spacing of the final synthesiser. The “N-counter” divides the output of the external voltage-controlled […]

Practical Application – Intercom Circuit

The simple switch shown so far can be used in simple audio applications. Here is a simple “all-master” intercom circuit that steers an audio amplifier towards one of several distant receivers. All units shown are identical and are connected to the same multipair cable. One battery powers all units. You press the button corresponding to […]

The LM555 Timer 1 part 8

The LM555 Timer part 8

audio analyzer circuit

Audio level indicator circuit spectrum analyzer for stress meter circuit diagram using UAA180 12 led indicator circuit spectrum analyzer for stress meter circuit diagram using UAA180

Great alarm monitoring circuit

Alarm monitoring Great alarm monitoring circuit using MJE2955, MJE3055 Great alarm monitoring circuit using MJE2955, MJE3055

How to make solar NiCad simple but useful ?

How to make solar NiCad simple but useful ? Reasons for using Solar Power Panel are: solar energy is clean, environmentally friendly, reducing pollution, reducing greenhouse gases and stopping global warming, as a flexible source of energy and require little maintenance, will help you save money in the long run. Using the charger and solar […]

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