Free electronic circuit design and schematic diagram
This is a circuit of Audio Decibel Level Meter. This circuit uses the SA604 which not only designed as an RF device but also the Received Signal Strength Indicator (RSSI). In a cellular radio, the radio’s microcomputer uses that function to monitor the received signal strength continuously. A logarithmic response proportional to the input signal level is given by this […]
Read moreThis is a MOSFET transistor video tutorial. This video provides information about n chanel MOSFET transistor and how it work. When the transistor is off, no current can flow so the one of the gadget wire is disconnect, so officially the gadget stay off. When the transistor is turn on, the current can flow then he both of gadget wires […]
Read moreThis is a video that provide the information about How find the resonance frequency and tune antenna wave traps. To find the resonance frequency we can use the wave traps. In this video, the wave traps is made of PVC pipe and the coils. Beside that, transceiver YAESU FT-897 or any HF receiver and grid dip meter are also required […]
Read moreThis video tutorial is about building a super spy bug transmitter. In this video we can see how to build a very small home made FM transmitter bug using a single transistor. To build this device doesn’t need much money. This devices has a transmission range of 200 meters. This video provide the schematic diagram of the circuit and the […]
Read moreThis is a simple circuit of Logic Probe for Tri-state Logics. This circuit can be built only in a few hours. Besides that, this circuit has some other advantages such as it is cheap, has high performance, and the LED will only light when tip of probe is touching a voltage source. A plastic ball-point pen can be used as […]
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Making a precision voltage source is easy, but not so easy if the voltage should be consistent over wide range of ambient temperature. Such requirement might be needed in high precision measurement system, for providing reference voltage in analog to digital conversion for example. Here is the circuit’s schematic diagram: The LM236, LM336 voltage references are easier to use than […]
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If we’re working with analog Ohmmeter, we get different scale for high and low resistance value, make the reading of higher value more difficult. Just switch your analog meter to voltmeter mode and use this adapter circuit to make resistance reading easier. Here is the schematic diagram of the circuit: This circuit uses LM336 for good stability. The LM336 is […]
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