Showing posts with label Converter. Show all posts
Showing posts with label Converter. Show all posts
Frequency to Voltage Converter Circuit
IC LM2917 Frequency to Voltage Converter
IC LM2917 IC chip is designed specifically as a Frequency to Voltage Converter or Frequency to Voltage converter. In its use to applications Frequency to Voltage Converter IC LM2917 requires few external components.
There are several examples of applications of Frequency to Voltage Converter IC LM2917 datasheet that is included in the LM2917 IC. In this article series Frequency to Voltage Converter IC also taken from the LM2917 datasheet. The advantages of single chip LM2917 Frequency to Voltage Converter is able to provide instantaneous volt output o at time of frequency change 0 Hz. Very easy to apply in measuring the output frequency with the formulation of single-chip Frequency to Voltage Converter VOUT = FIN x VCC x R1 x C1.
Then the single-chip LM2917 Frequency to Voltage Converter This configuration requires only the RC only in frequency doubling. And has an internal zener regulator to aimlessly accuracy and stability in frequency-to-voltage conversion process.
Application circuit Figure IC LM2917 as Frequency to Voltage Converter
Feature-owned single-chip LM2917 Frequency to Voltage Converter
Reference to ground directly with variable reluctance
Op Amp / Comparator with transistor output
50 mA maximum output currents for application directly to the load
Frequency doubling for low ripel
Buid in zener
Linear output ± 0.3%
Application single chip LM2917 Frequency to Voltage Converter
Frequency to Voltage Converter
Rotation speed sensor applications
Speedometer
Tachometer
Cruise Control
Cluth Control
And other applications associated with the measurement of rotation speed or frequency measurements.
Simple Circuit 12V to 120V DC DC Converter
When pin 1 is high transistor Q1 conducts and current flows through the upper half of T1 primary winding. When pin 2 is the transistor Q2 conducts and high current flows through the lower half of the primary coil T1. As a result of a voltage of 120 V AC are induced in the secondary of T1. This voltage is rectified with bridge D1 to provide a 120V DC output. Capacitor C2 is the DC input filter, while C3, C4 are the output filters.
Notes.
- The circuit can be assembled on a vero board.
- Q1 and Q2 require heat sink.
- Output power of this dc dc converter is around 100 watts.
- IC1 and IC2 are to be mounted on holders.
- An optional 5A fuse can be added in series to the 12V supply line.
- T1 can be a 9-0-9V /250V/3A mains transformer.
- If 3A bridge is not available make one using 1N5408 diodes.
- Out of the two Flip-Flops inside CD4013 only one is used here.
- Output of IC1 must be set to 100Hz by adjusting preset R1
12v to 5v dc dc converter circuit diagram
Power supply is needed for all of electronic circuits. Say you have a 12V power supply and you want to use it as a 5V power supply. Then use this 12v to 5v dc-dc converter circuit diagram to convert 12 volt to 5 volt. This DC converter circuit provide 5V, 1Amp at output. Here is the small schematic circuit diagram of 12volt to 5volt converter.
Circuit Diagram of 12VDC to 5VDC converter:
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| Fig: 12 volt to 5 volt dc converter circuit schematic |
This DC-DC converter is based on IC LM7805. The LM 7805 is a 3-terminal fixed output positive voltage regulator IC. The output current of this circuit is up to 1Amp . Use a heat sink with LM7805 to protect the IC from overheating.
4-Bit Analogue to Digital Converter Circuit Diagram
The operation of the converter is based on the weighted adding and transferring of the analogue input levels and the digital output levels. It consists of comparators and resistors. In theory, the number of bits is unlimited, but each bit needs a comparator and several coupling resistors. The diagram shows a 4-bit version. The value of the resistors must meet the following criteria:
- R1:R2 = 1:2;
- R3:R4:R5 = 1:2:4;
- R6:R7:R8:R9 = 1:2:4:8.
The linearity of the converter depends on the degree of precision of the value of the resistors with respect to the resolution of the converter, and on the accuracy of the threshold voltage of the comparators. This threshold level must be equal, or nearly so, to half the supply voltage. Moreover, the comparators must have as low an output resistance as possible and as high an input resistance with respect to the load resistors as feasible. Any deviation from these requirements affects the linearity of the converter adversely.
Circuit diagram:![]( "4-Bit")
4-Bit Analogue to Digital Converter Circuit Diagram
If the value of the resistors is not too low, the use of inverters with an FET (field-effect transistor) input leads to a near-ideal situation. In the present converter, complementary metal-oxide semiconductor (CMOS) inverters are used, which, in spite of their low gain, give a reasonably good performance. If standard comparators are used, take into account the output voltage range and make sure that the potential at their non-inverting inputs is set to half the supply voltage. If high accuracy is a must, comparators Type TLC3074 or similar should be used. This type has a totem-pole output. The non-inverting inputs should be interlinked and connected to the tap of a a divider consisting of two 10 kΩ resistors across the supply lines. It is essential that the converter is driven by a low-resistance source. If necessary, this can be arranged via a suitable op amp input buffer. The converter draws a current not exceeding 5 mA.
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