Pin Computer
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what is the pin arrangment of a phototransistor used in computer mouse?
i took a photodiode and a phototransistor from a computer mouse and i want to use them in anouther application by measuring the pulses that came from the transistor by putting a wheel with holes between the diode and the transistor
the transistor have three pins i want to know which one is the collector and which is the base and which is the emmiter
The photodiode is what emits the IR light for the phototransistor to use. Measure the DC voltage on the photodiode... the positive voltage will be on the anode lead. Run the photodiode like you would any LED (with a series resistor).
The detector is not a regular phototransistor - it is a dual-sensor device (containing two phototransistors). Of the three pins, one will be common, usually connected to ground (like an emitter in an open-collector transistor circuit), and the other two leads will be tied to Vcc (positive supply voltage), through resistors.
Again with a DC voltmeter, find the circuit ground on the mouse board, and connect the negative lead from the meter there. Then measure the voltages on the three pins of the photodetector. The pin that always measures zero-volts will be the emitter (tied to circuit ground - almost always the center pin on the device). The other two pins will toggle between a low voltage ( These two pins are effectively open-collectors, and will sink current when there is light present (through one of the slots in the encoder wheel). Just connect these pins to positive voltage, and take the output from the junction between the resistor and the detector pin. Together, these two outputs will form two square waves that are 90° out of phase when the wheel is turned (or the mouse moves). Read up on "quadrature encoders" for more info on these signals. RAM is a fundamental part of the computer operating system. It may not be possible to run a system effectively if it is running low on RAM. But the primary concern of all the people is as to how much RAM would be adequate for their system, which may or may not be possible for people to determine. Blending DRAM with SRAM: As both the static & dynamic memory modules were clubbed together, the Cellular RAM module came into existence. Auto refresh, low power consumption, quick access, high-speed read & write, fast data transfer and SRAM pin compatibility prove to be some of the finest features of this hybrid computer RAM module. Stepping the Complete Dynamic Age: As the in-built capacitor and integrated circuit was improved, computer RAM manufacturers came up with DRAM (Dynamic Random Access Memory). Although it needs to get refreshed on a regular interval (otherwise the data can be lost), it has several other added advantages in comparison to other RAM modules. Now-a-days, the industry is witnessing advancements in computer RAM, ranging from DDR RAM to DDR2 RAM and DDR3 RAM that ultimately lead to dual data rate & triple data rate transfer capacity. This all helps in increasing the speed and efficiency of a computer. RAMs are available in various storage capacities ranging from 512MB to 1GB, 2GB, 4GB, 8GB and so on. The higher you go, the better efficiency you get. This is the reason why people tend to upgrade their computer RAMs if they are into web designing, online gaming or any such field that requires heavy RAM usage. When it comes to the DRAM modules, the suppliers and RAM manufacturers offer Dual in-line package (DIP) with: Single In-line Pin Package (SIPP) Single In-line Memory Module (SIMM) Dual In-line Memory Module (DIMM) Rambus In-line Memory Module (RIMM) Small outline DIMM (SO-DIMM) Of all these, the DIMM is the most common one used in present day laptops and computers with: 72-pin (32-bit) 144-pin (64-bit) used for PC100 / PC133 SDRAM 200-pin (72-bit) used for DDR and DDR2 240-pin (72-bit) used for DDR3 These technical configurations have made industry very specific for clients' requirements. You can tell your RAM supplier or RAM manufacturer the exact requirements for your work and ask him to get the most compatible RAM module for you. About the Author The author is an expert writer in the field of the technology and writes for leading computer ram and computer memory component manufacturer. Presently writing on various topics related to computer hardware and peripherals like Computer RAM, Memory Components, USB storage drives, memory cards, memory modules and other computer products. DEM FRANCHIZE BOYZ (PIM PIN ) COMPUTER LOVPSRAM Cellular RAM: Pioneering Enhanced Computer Efficiency
