Simple Pulse Oximeter Circuit Diagram

This circuit is a pulse oximeter, it is a medical device to indirectly measure the amount of oxygen in the blood of a person. The circuit is very simple and inexpensive to build, the sensor to be monitored only need an oscilloscope, but the case does not have an oscilloscope, here an article on how to make your pc a Oscilloscope. The operation is simple, light from an LED shines through on one side of your finger and is measured across the photo-transistor, a clothespin wood will engage the LED and the photo-transistor as a way to mount and align the sensor with finger.

The monitor circuit uses only a single IC LM324 operational amplifier. There are three basic steps, the input signal is decoupled before being pre-amplified then passes through an adjustable low-pass filter to help eliminate noise 60Hz AC and finally a further low-pass filter in parallel with amplifier.

Pulse Oximeter Circuit Diagram

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NE566 Function Generator Circuit Diagram

The NE566 Function Generator is a Voltage-Controlled Oscillator of exceptional linearity with buf fered square wave and triangle wave outputs. The frequency of oscillation is determined by an external resistor and capacitor and the voltage applied to the control terminal. The Oscillator CAN be programmed over a ten-to-one frequency range by proper selection of an external resistance and modulated over a ten-to-one range by the control voltage, with exceptional linearity. FMAX = 1 MHz WIDE 1000:1 Continuous Sweep Possible NE566 Function Generator Circuit Diagram Pdf Datasheet Sourced by : Circuitsstream

TDA2030 complete tone control

At this time I present a series of amplifiers that use IC TDA2030, but this series is equipped with a tone control. Tone controls include Bass, Treebel, and Volume. Power amplifier and tone control has been put together in a single PCB. As well as its power supply circuit was also used as one with the power amp, and tone control. Making it easier in the installation and will look neat. Schematics Layout PCB PCB design This amplifier is a mono amplifier type, can be modif for guitar amplifiers. If not coupled amplifier (mic preamp) then you must deactivated potensio treble and bass, why? because if not using a mic preamp and still maintain potensio treble and bass sound input (input) from the guitar will not or the maximum discharge is not tight on the speakers. So you must deactivated a way to decide which directly connected capacitor with the tone control circuit, and capacitor were connected directly to potensio volume and input jack.

Simple Preamplifier and High to Low impedance Converter Circuit Diagram

This is the Simple Preamplifier and High to Low impedance Converter Circuit Diagram. This circuit matches the very high impedance of ceramic cartridges, unity gain, and low impedance output. Simple Preamplifier and High to Low impedance Converter Circuit Diagram By `loading` the cartridge with a 2M2 input resistance, the cartridge characteristics are such as to quite closely compensate for the RIAA recording curve. The output from this preamp may be fed to a level pot for mixing. Sourced By: Circuitsproject

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