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. […]
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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 […]
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 […]
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 […]
This pre-tape circuit is cheapest for beginner only. And easy to builds because use one IC-UPC1032 only as Figure 1. Fig1: The circuit diagram This is stereo can connect to the tape header that resistance between 200-600 ohms at output amplitude about 250 mV. Fig 2: The PCB layout The power supply voltage that can […]