Free electronic circuit design and schematic diagram
The TDA7088T can be used in mono portable and pocket radios. This is a bipolar integrated circuit. Here’s one of the application circuit diagram: When a minimum of peripheral components (of small dimensions and low cost) is important, we can use TDA7088T. Frequency-locked -loop (FLL) system with an Intermediate Frequency (IF) of about 70 KHz is built on this circuit. […]
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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 […]
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The circuit diagram below is a simple RS-485 circuit. Full-duplex communications (simultaneous transmission and reception) with only two essential packages (IC2 and IC3) is provided by this circuit. For high-noise environments or for long-distance transmission between a computer and it’s peripherals, the simple RS-485 balanced and differential data lines are necessary. Such transmission are difficult, if possible, using the single-ended […]
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 […]
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We can use NE556 timer IC to make indication of static of terminal in digital logic audible. Audible logic probe can be very useful when we have to visually inspect a part while need to check the logic state on other point apart from the part. Here’s the circuit diagram: NE556 will act as oscillator controlled by IC1 (SN74132N) and […]
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A single CMOS IC is used on this logic probe. This logic probe shows three logic condition, High, Low, and Pulsing. Ind addition, there is no LED’s will glow if the probe input is neither hi or lo ( the high impedance state of tri-output logic IC’s). Here’s the circuit diagram: This logic probe using power from the logic circuit […]
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 […]
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