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HarryA
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Posts posted by HarryA
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When a post is made the forum software often displays key technical words in the post description. This would suggest that one could use that software to detect post that are legitimate from others. Of course the the devil is in the details. Invision's Zendesk maybe open to support on something like this as it would also be to their benefit. When I had a forum (Simple Machine's software) I spent a lot of time mutilating the software to get what I wanted.
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Practical Electronics for Inventors is a good book. Used copies are available.
An online lab that is informative; you can download the pdf files from: Hunter College
Lots of free info on Youtube.com
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First off one can not read the text on the second IC. They claim fake ICs come in two types; those that are commercial grade and sold as military grade.
And those that are used from discarded equipment. The latter type may well have the correct text on them. I gather they do not manufacture fake ICs as they are too inexpensive to be bothered with.
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You need to supply schematic diagrams for the two circuits.
If you need help with creating schematics ask.
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The Mega 2560 has 54 digital I/O pins plus 16 analog pins for a total of 70. You lose 2 pins for the display for either the PC display or LCD. You can have speech on the PC for free.
You may need a larger LCD for numerous pins. Mapping the Mega pin numbers to the cable pin numbers would have to be predetermined. Some connectors use alpha characters (A - Z) I gather.
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If it interest you, I could program the micro-controller for you. That would give you an introduction to micro-controllers. The micro-controller is about 21$, a LCD about 13$, You would need a 9 volt battery, a battery connector, a battery to micro_controller connector, and a switch also.
An assortment of colored wire would be helpful. Plus a plastic or metal box to pack it all into.
If you are checking your cables near a computer you could uses the computer as a simple display device instead of the LCD.
Micro-controller: https://www.amazon.com/ELEGOO-ATmega2560-ATMEGA16U2-Arduino-Compliant/dp/B01H4ZDYCE/ref=sr_1_2_sspa?crid=1L06F0IP302BX&keywords=Arduino+R3+Mega2560&qid=1684882151
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You could use an Arduino Mega 2560 as it has enough digital input/output pins for your 28 connections. Other micro-controllers may work but I only know the Arduino controllers.
Do you need more than a simple one line display? "Yup pin 13 is okay"
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The D13005MD relates to the 3DD13005MD if that is any help. One would want to compare the two data sheets. It is not very likely one would have such a high power and high voltage transistor in ones stock.
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Just for you, anyone else there would be a fee😏
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No, just simply add a capacitor to the AOUT terminal ahead of the speaker from your board. Can you trace pin 5 of the LM386 directly to the AOUT terminal ?
There may or may not be a small capacitor and resistor connected to pin 5 also.
UPDATE: It look like the board already has an output capacitor. The yellow 227C is a 220 microfarad capacitor. So you do not need to add one. see: https://www.ebay.com/itm/391354402991?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338766894&toolid=20006&
Just connect your speaker to the output terminals.
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It looks like the unit you have is designed to work with a high impedance load like the input to the Arduino. Typically for a LM386 driving a 8 ohm speaker a 220 to 250 microfarad capacitor is used with the negative lead to the speaker. Try adding one to your unit. see the circuits here:
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Perhaps you could get information from dioo via email. https://www.dioo.com/#/ProductsDetail?id=889
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You could check the voltage output of the power supply before and after you have a problem with the unit. That would tell you if it is the power supply or not.
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It is difficult to help you with no circuit diagram or photographys. Such problems are often thermal in nature. Something supplying current to the relay over heats and shut down perhaps.
"Sometimes when turning on USB memory, or as the selected player plays. " Does that block it or unblock it?
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What are the status attributes of a transformer other than temperature?
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See: https://en.wikipedia.org/wiki/USB
Be sure to look through the references at the end of the article.
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3 hours ago, reeldeal67 said:
turntable and it has a grounding issue, a deep hum.
Does the turntable have electronics in it; preamplifier and power supply perhaps? The capacitors in older electronics often go bad with age.
see: https://en.wikipedia.org/wiki/Ground_loop_(electricity)
note the section: "In low frequency audio and instrumentation systems" and the note near the bottom of the article.
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As gamer87 you have quite a reputation on the maker.pro forum. They lock the door as soon as they see you coming! They have no sense of humor over there.
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In circuit 2 for the RTS0072 note they have an RC sub-circuit at pins 1 and 2, I would try that. Also note at pin 16 there is a resistor Rb to prevent pin 16 being pulled to ground. Perhaps required? Note it uses a 4.3 volt Zener; it must work okay with that voltage.
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I found the forum cookies were blocked on my end. I had thought I had removed the URL from about 20 or so sites I have blocked from setting cookies. Thanks for looking on you end.
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When I try to login with my desktop computer I get this error code. Forum is unhappy with my desktop computer. I can login via my laptop okay. [contact us] does not work also - can not enter a message.
allowing 0.1 volt or greater “filter” in 12v DC
in Electronic Projects Design/Ideas
Posted
Perhaps a voltage comparator? See: Comparator
You could use the 12 volts to trigger a relay that supplies a voltage to the timer? The relay should require more than 10 volts to trigger the relay to avoid the rewind? It is not clear where the 0.0009 volt and 0.1 volt signal comes from.