Free electronic circuit design and schematic diagram
If we don’t need a very fast analog-to-digital conversion (ADC), by combining TC9400 V/F converter with a counter, latch and time base, we can build a13 bit binary A/D converter. A 1 second time base will provide one conversion per second when the V/F converter is set up for 10KHz full scale. The high input impedance of TC9400 make it […]
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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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Microphone pre-amp is a very simple circuit, most all low noise op-amp will be sufficient for this circuit (TL071, TL082, OPA371, NE5534, etc). This circuit will be suitable for dynamic microphone, electret microphone (or a condenser microphone with active circuit inside). A condenser microphone (without voltage bias source) won’t work for this circuit. If you want to use it, you […]
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Another example of frequency-to-voltage converter application similar with RPM/Speed Indication is motor speed control. Here the converter is used to measure the actual speed which will be fed back to keep the actual speed stabilized according to a reference. Here is the block diagram of this control system: If the speed is to high, the output of the F/V converter […]
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