Posts Tagged ‘analog to digital converter’

Simple Amplifier circuit for converts the analog signal to digital

The electrical signals from transducer,Sometimes, it is value less too,For input to the circuit to convert signals from analog to digital.To achieve a satisfactory,We need a power amplifier, who can tell strength of the input signal is simple.This can extend the input signal from the transducer is 10 times and 100 times.
Circuit consists of op-amp IC1 No. 741,To give the appearance of non inverting circuit, R1 is configured input impedance switches.In this the 75 kilo ohms, negative feedback circuit consists of R3 or R4 together with R2, which defines the gain of the circuit.
Gain of the circuit is equal.
R2 + R3 / R2 When S1 scroll at the top.
R2 + R4 / R2 When S1 scroll down below.
When the value provided in the circuit will gain about 100 and 10 respectively (actually supposed to be 101 and 10.1).
Power supply for this circuit requires two sets of power supply positive and negative, which was in the range of positive, negative 6 volts to the positive, negative 15 volts, in this value add, subtract 9, because available with 9-volt battery immediately.

Sine Wave To TTL Converter

As the title implies, the present circuit is intended to convert sinusoidal input signals to TTL output signals. It can handle inputs of more than 100 mV and is suitable for use at frequencies up to about 80 MHz. Transistor T1, configured in a common-emitter circuit, is biased by voltage divider R3–R5 such that the potential across output resistor R1 is about half the supply voltage. When the circuit is driven by a signal whose amplitude is between 100 mV and TTL level (about 2 V r.m.s.), the circuit generates rectangular signals. The lowest frequencies that could be processed by the prototype were around 100 kHz at an input level of 100 mV, and about 10 kHz when the input signals were TTL level.
Resistor R6 holds the input resistance at about 50 ?, which is the normal value in measurement techniques. It ensures that the effects of long coaxial cables on the signal are negligible. If the converter is used in a circuit with ample limits, R6 may be omitted, whereupon the input resistance rises to 300 ?.
Source: http://www.extremecircuits.net/2010/06/sine-wave-to-ttl-converter.html

Related Links
Analog to digital converter
Sine wave converter square wave
TTL digital circuit
S/PDIF to Analogue Converter
Super Light Sensor
Analog to Digital & Digital to Analog
Simple Amplifier circuit for converts the analog signal to digital

VCO – Analog to Digital by LM331

This Circuit is a simple Analog to Digital Interface with a capability of 10 to 12 bits resolution. 10 bits means 1024 counts or parts of a full scale FS which is close to 3-1/2 1999 counts. In this 1 V can be read as 1.000 V that means even 1mV can be resolved for FS of 1V.
The Caps C6 and others must be plastic multilayer low-leakage types for accuracy of reading. Use all 1% MFR 100ppm or better resistors, Design gain of U1B for the Full Scale you want. The Output Fout is a Frequency which is directly proportional to the measured voltage Vin.
The pulses can be isolated using opto-couplers to avoid ground loops or electric hazard. An additional protection and scaling circuit at the input may be required for some sensors.

Read more Source: Mr Anantha Narayan

http://schematics.blogspot.com/2005/01/vco-with-lm331.html

Thank you.

Related Links
Analog to digital converter
Interface circuits
VCO circuit
S/PDIF to Analogue Converter
Analog to Digital & Digital to Analog
Simple Amplifier circuit for converts the analog signal to digital
1.2GHz VCO With Linear Modulation
Comparator Oscillator Circuit by LM311