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 […]
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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 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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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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This is a single supply instrumentation amplifier circuit. This circuit can be used to replace the function of conventional differential-amplifier topologies to load the Dc gain on a low level signal. This circuit has high input impedance of non-inverting op-amp inputs. Here is the circuit : This circuit uses single supply, so the strain gauges are operated from Vcc. There […]
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High precision analog front end (signal conditioner) presented here can be used for portable ECG equipment that requires single-supply operation. There are two kind of amplifiers on the circuit diagram, the instrumentation amplifier INA326 and the dual precision amplifier OPA2335. Both operate from a single 5V supply and apply autozeroing techniques. Autozeroing techniques will keep the initial offset and offset […]
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