Free Simple Circuit Diagram
This LM10 circuit can be used as low voltage low current voltage source or reference. This circuit regulate the voltage from the power supply to give a very stable output. The minimum voltage level for powering this circuit require only 0.2V above the output level, showing the low drop out (LDO) feature of this circuit. [Circuit’s schematic diagram source: National […]
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This is a three-modes lamp dimmer circuit with touch control. This circuit can be used to control a lamp in 3 operation modes: dim, off, and bright. A NE555 timer is used to generate a one-second pulse when we touch the touch plate. The human body produces ambient ac fields which will be used to trigger the NE555. An input […]
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This is a voltmeter circuit that use FET as the buffer to improve the input impedance. This circuit uses A2N3819 FET which provides a solid-state VOM. Beside that, a cathode follower in a VOM of this circuit is The 2N3819. The calibration of this circuit is done by adjusting R12 (scale/sensitivity) and R14 (zero offset). Since FET has very high […]
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This schematic diagram below show a circuit of VOX Box (voice-operated switch). This circuit consist of a Schmitt trigger, a relay driver, and microphone preamplifier. The microphone preamplifier(U1) receive input signal which will be amplified. THRESHOLD control (R8) is fed by the amplified signal. The trigger’s output goes high when the preselected threshold voltage level is exceeded. Here is the […]
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