Free electronic circuit design and schematic diagram
This is a Reduced Hysteresis Diac-Triac Phase/Power Control circuit. This circuit is used to control from 5% to 95% of full load power. This circuit can decrease the hysteresis effect to a reasonable region. It can be done because this circuit uses second RC phase-shift network. Beside that, the second RC phase-shift network also extends the range on control. This […]
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Hysteresis in lamp dimmer or in other electric appliance might cause some trouble if you need a fine tuning, something like out of control. This is a circuit of Diac-Triac Phase/Power Control without Hysteresis. This circuit can eliminate the hysteresis effect. Here is the circuit: The initial condition of the timing capacitor is uniform because the (a) circuit reset timing […]
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One easy way if load current is approximately 5 A or less is shown on figure below. The sensitive gate triac acts as a direct power switch controlled by TTL, HTL, CMOS, or integrated circuit operational amplifier. The triac can be activated by a timed pulse from the system’s logic from anywhere in the AC sinewave producing a phase-controlled load. […]
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This is a Overvoltage Protected 5V Power Supply circuit. This circuit can be used to supply 74LS series integrated circuit and TTL. This circuit can protect the TTL or 74Ls series integrated circuit from damage because these ICs are easily damaged by short voltage spikes. This circuit uses a fuse which if the current rating is exceeded, the fuse will […]
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This discrete voltage regulator has complete features that is equivalent with modern voltage regulator integrated circuit (IC). It’s not cheaper if you build discrete one like this, but it’s always interesting to study the schematic diagram to learn how it works. Here is the schematic diagram of the circuit. Volatge Regulation Look at the 6,8k resistor, it should be dotted […]
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This transformer-rectifier-filter arrangement gives you multiple output voltages with a single transformer. This AC-DC converter can be your solution is you need two level of symmetric power supply. Here is the schematic diagram of the circuit: U1 and -U1 uses a basic symmetric supply configuration, with a center-tapped transformer and full bridge rectifier for. U2 and -U2 uses a voltage […]
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This is a voltage multiplier circuit. This circuit uses a doubler principle to multiply the voltage. This circuit has some advantages like low current supply, attractive high voltage that is needed for photomultipliers and cathode-ray tubes. Besides that, this circuit is inexpensive. This principle is also used in the Cockroft-Walton accelerator for charged particles the Cockroft-Walton accelerator for charged particles […]
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