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 One button code Switch

Saturday, October 25th, 2014

The most code switch will be a key number 1 to 10 is good. But when I press a number key often until has track, making it possible to guess the code. This circuit use the normal door bell switch is the code enter. The code include pulse short and long like the mos code. […]

 Current Transformer AC Load LED Indicator circuit

Friday, October 24th, 2014

This is the LED indicator for show AC current load, that use the transformer and LED as based of circuit. Sometimes we need to detect the large AC current. One way is the LEDs is connected with the resistors and the diode 1N4001 networks. But this have disadvantage is voltage drop across too much. There […]

 VHF Dip Meter circuit

Thursday, October 23rd, 2014

This is a simple VHF dip meter circuit.The DIP meter is the frequency meter by use the LC resonance circuit that adjustable until the frequency show peak amplitude. The circuit include variable frequency generator circuit, rectifier and a moving coil meter. In the oscillator include two transistors T1 and T2. The tuning circuit include C1 […]

 Digital logarithmic sweep signal generator circuit

Wednesday, October 22nd, 2014

This is a Digital logarithmic sweep signal generator circuit by use the average digital, It is designed to use together with the frequency generator by voltage controller. How it works From the circuit in figure 1 is the 14-bit binary counter circuit, that input is synced with the output of oscillator generator circuit. Then, the […]

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