Free electronic circuit design and schematic diagram
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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To accomplish A/D conversion with V/F converter in a microcontroller system, there are two schemes that can be utilized. First, VIN is measured by counting the FOUT frequency for 1ms, 10ms, 100ms, or 1 second depending on the number of digits of resolution required. The final count is then directly proportional to VIN. (The microcontroller provides the time base) .Second, […]
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Temperature measurement (sensing) and monitoring will be economical and straightforward if we apply the input of TC9400 V/F converter with a voltage from output of a probe, such as shown in diagram below. The V/F output is simply counted to display the temperature. The TC9400 can be used to modulate an RF transmitter for a long distance data transmission. The […]
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Process industries deal with various control systems, and fluid mass transfer control is one of them. We can use a TC9400 F/V converter to regulate the amount of liquid or gas flowing through a pipeline. A pulse train whose frequency is proportional to the rate of flow through it is generated by the flow rate detector. This frequency is converted […]
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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 is a 3 Band Equalizer circuit. This circuit is made to control the treble, middle and bass range. This circuit uses a single op-amp. With single op-amp we can build equalizer which has three ranges, high frequency, mid frequency, and low frequency. Here is the schematic diagram of the circuit: This circuit has a cut off frequencies of 10kHz, […]
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