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Dual-in-line package: LTV 1-channel type. LTV 2-channel type. LTV- 4-channel type. * Wide lead spacing package: LTVM: 1-channel type. Tel: Fax: / http://www. Photocoupler. Product Data Sheet. LTV (M, S, S-TA, S-TA1, . Lite-On LTVB: available from 21 distributors. Explore Optoelectronics on Octopart: the fastest source for datasheets, pricing, specs and availability.

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Introduction to Microcontrollers Mike Silva. This used different instructions and made the PIC look more like an processor to the programmer.

LTV-817 datasheet

In a plain transistor circuit as opposed to a phototransistorthe base current would come from a voltage through a resistor, and we could add parallel capacitance to this resistor. Some boards use thicker copper plating to handle high currents. Designs have to work first, and be inexpensive second.

Think about that for a bit.

datashet The third lesson is to get your priorities straight. Create free account Forgot password? He said some of the connections on the circuit board had been open-circuited.

Comments Write a Comment Select to add a comment [ – ]. So I wrote out some flowcharts of how I wanted the program to behave at a high level, and said make it work like this.

When the transistor collector-to-emitter voltage drops to the point where the base-collector junction becomes forward-biased, this stores additional charge. Save your cost-down energy to be ready in time for the volumes in which it will pay off.

Another technician and I looked closer, and we found that the thermal reliefs on some of the vias were the culprit. Power bipolar transistors might have a current gain in the range, and there were all sorts of tricks for driving them on and off quickly.


After that, some uglier techniques come into play esp for sucking the charge out of the base. These each had four spokes, and they were very narrow, so they turned into fuses. It still had some problems, which I finally traced down to a ferrite drum-core inductor. Several months ptv817 this process, Mr. Let that sink in — it was an assembler used ltc817 program the PIC16 architecture with completely different instructions. The battery requests a certain amount of current, and the charger is supposed to deliver up to that current.

We could put a capacitor in parallel with whatever resistance we use to drive the LED, and it will add a short high-current pulse when the LED ltvv817 first turned on. Oh, and you get an output enable pin for free. They worked well, but were too expensive to go into production. The other techniques would be available to us if we had access to the base terminal.

Eventually we got an updated prototype. Foxtrot out of the picture, and I took over the software design as well, learning SPASM because it was too difficult to convert the code to the native Microchip assembly instructions without the risk of introducing new errors.

Optimizing Optoisolators, and Other Stories of Making Do With Less

The exposure of light onto the phototransistor essentially acts in place of the normal base current. Receive a notification when Jason Sachs publishes a new article: Hi Jason, thanks for another great article – I’ve enjoyed all your embedded related articles so far! Although bipolar transistors will probably be around for a while, I think the techniques of using them are at risk of becoming obscure.


Foxtrot sent us the first few prototypes. And everyone in the chain gets a share of the profits. Circuit Design Analog Circuits Optimization.

R1 and R4 are the basic resistors setting input current and output load. The second round of prototypes were better, and he sent a few of them to us.

LTV OPTOISOLATOR 1CH 4-DIP Lite-On Inc datasheet pdf data sheet FREE from

Life gets even more complex when you are heavily current constrained – putting loads of LED current in only helps if its not limited. One trick to reduce this impact on critical circuit nodes used in solderless breadboards, is to leave an empty row between each circuit node.

I had been working about 18 months after graduating college. On one side of the package, you put in current through the LED. One more quick comment before we do, though: If you use an op-amp as a comparator, when lt8v17 output goes high or low, and the inputs stray apart from each other, the op-amp saturates, and it may take a long time to come out of saturation. It was a cost-cutting measure on a circuit board that needed to handle the current.

Optimizing Optoisolators, and Other Stories of Making Do With Less – Jason Sachs

And good designers knew datasheer to make use of them. Sachs, all rights reserved. So he changed it to one ounce copper. The year was