Free electronic circuit design and schematic diagram
This 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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This shunt regulator acts like a Zener diode, but we can adjust the voltage (via a potentiometer). Here is the schematic diagram of the circuit: When the maximum load current is known, then we can choose Rs such as that Rload (at max current) and Rs form a voltage divider that gives a voltage level at slightly higher than the […]
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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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Multiple Feedback (MFB) is the best filter topology to use for differential low pass filters. Here’s the circuit diagram: To design this filter, a corner frequency is chosen based on harmonic content desired in the waveform. After that, we have to select a value of capacitor. The value of C1 is equal to C and C2 is equal to 2.67 […]
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