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Hero999
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abdou reacted to a post in a topic:
lm7805 question
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HaddyS reacted to a post in a topic:
negative ioniser
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HaddyS reacted to a post in a topic:
Measuring low current on high voltages?
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HaddyS reacted to a post in a topic:
How to choose a high voltage relay
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JerryAcert reacted to a post in a topic:
Re: high voltage meter problem
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LorrineVof reacted to a post in a topic:
How to choose a high voltage relay
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joeydennis11 reacted to a post in a topic:
Overload Protector A16 ???
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FranceRouze reacted to a post in a topic:
555 dc motor controller
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A low value resistor connected in series with the fan can be used to measure the current flowing through it. The voltage across the resistor, therefore the current, can be calculated using Ohm's law. Each fan will need to have its own current sensing resistor.
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What do you mean by internal detection? You could measure the current through the fan motors and if it's too high or too low, it's a reasonable indication that the fan isn't working properly. It's not as reliable as monitoring the air speed but it's better than nothing.
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Replace the Darlington with a MOSFET. The IRF3415 or IRL540 would do.
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Could you please post the schematic. Sorry if you've already posted it. This thread is 76 pages long and many of the links are broken.
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A schematic would help us to answer the question. I wouldn't recommend either. A MOSFET would probably be better.
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Which schematic are you building? The link on the first post in this huge topic refers to a 50V PSU and the schematic is very fuzzy and unclear. I take it you're building a different one?
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Yes there is. That's what R21 to R41 is.
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If an AC signal is applied to either of those circuits, the capacitor will just charge up, then no current will flow, except that due to the diode reverse leakage and capacitance.
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The new forum software has brought with it a few problems. Lots of the old posts, threads and attachments have gone and some users have experienced difficulty uploading attachments. http://electronics-lab.com/community/index.php?/topic/41121-about-file-uploading/&page=2#comment-157554 Overall its much more quiet than before. I think we should go back to the old software. The new software has been given a fair trial and the forum as only deteriorated further, so it's time to go back. Of course the admin has the final decision.
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Of course the TDA7297 is not too small to fit on a PCB. Any IC can be mounted on a PCB, no matter how small. I think what he's saying is it's not the right shape to fit on a breadboard or stripboard. For a start don't even consider trying with breadboard, which isn't suitable as the current is too high. As for a stripboard: the pins can easily be bent so it'll fit and assemble it as neatly and as compactly as possible.
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Did you upload your avatar from your hard drive or somewhere else on the Internet? Usually I'd advise you install all the relevant updates for your browser and operating system but I'm able to post attachments from my work's PC which is running an old version of Firefox.
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The sound card needs to form part of the circuit. Try this.
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Where did you get the schematic from?
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Fortunately SMT to DIP adaptor boards aren't expensive. http://www.adafruit.com/products/1212 http://www.hobbytronics.co.uk/soic-dip-breakout-8-ht?utm_source=google&utm_medium=googleshopping&utm_campaign=googlebase&gclid=CJDy8piCnccCFYvKtAodJ9QMSA http://www.banggood.com/40pcs-SOP8-SO8-SOIC8-SMD-To-DIP8-Adapter-PCB-Convertor-Double-Sides-p-88940.html?currency=GBP&createTmp=1&utm_source=google&utm_medium=shopping&utm_content=saul&utm_campaign=Electronic-xie-uk&gclid=CODOqtOCnccCFS3ItAodq6UCQQ
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If you're still having problems with attachments, you could upload the schematic to another imaging hosting service and post a link to it here. http://tinypic.com/index.php
