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 2 transistors Microphone preamplifier

Saturday, August 23rd, 2014

This is a simple microphone preamplifier circuit that use 2 transistors are connected in the direct coupling, to respond the signal even better. How it works In Figure 1 the circuit diagram On collector of Q2 will feedback signal to the emitter of Q1, To frequency response is improved. And,at the same time R1 will […]


 Modify Acoustic into the electric guitar on FM wireless transmitter.

Friday, August 22nd, 2014

This circuit is used to Modify an Acoustic into the electric guitar on FM wireless transmitter system. It is small, cheap, easy to build. The acoustic guitar pickup of this circuit like working of the condenser microphone. Which is good because This system has less distortion than the general guitar pickup, that include of magnets […]


 LM380 2.5W Audio Power Amplifier

Wednesday, August 20th, 2014

Many circuit use LM380 Why? and hot to use it. I find datasheet at NT is good ICs. below is short datasheet that you can use it on basic. The LM380 is a power audio amplifier for consumer applications. In order to hold system cost to a minimum, gain is internally fixed at 34 dB. […]


 How to use normal multimeter to measure high AC current.

Tuesday, August 19th, 2014

A general cheap analog multimeters will not have directly AC current ranges.  But we are an Electric Appliance Repair, will always have this problem. For example: Measuring current of the electric appliances. How to modify our meter? We can modify the multimeter on AC 10V range to measure AC current 0-10A,use a 1 ohms resistors […]


 The parts you need.

Sunday, August 17th, 2014

Now that I am older,bad memory. It is slow and may be faulty. Ancient people used to say that when do not remember, so must be noted protect to forgetting. Thus I will write this article to me. but not only me It may be useful to everyone. Switches SPDT- Single-pole, Double-throw



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