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Type: Posts; User: Pjdd

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    Closed: WL500R datasheet needed (UHF receiver IC)

    I hope this is the right section for this:
    I've been trying - and failing - to find the datasheet for a single chip UHF receiver IC. It's used in a cheap Chinese 433 MHz ASK/OOK receiver module. The...
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    Closed: Re: problem with pcb etching

    One vital point that has not been mentioned yet is that the raw copper-clad board has to be kept very clean before etching. Even a fingerprint will slow down the etching process.

    Clean the board...
  3. Closed: Re: li-ion voltage reducer to 3volt - help needed

    I second KlausST's recommendation of an LDO (low drop-out regulator). There are many types available but some of them consume an appreciable amount of current in addition to the load. For example,...
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    Closed: HT12D decoder output polarity

    I've known about the popular HT12E & HT12D encoder-decoder pair of ICs for a long time but never had any reason to use them until now. I don't have them in stock and and can't try them out now. So I...
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    Closed: Re: Very Low Current LED

    Pamcho may simply be having some low quality LEDs or those made with very old technology. I remember buying a 100-pack of red LEDs some 30 years ago during a visit to a city (I live in a small remote...
  6. Closed: Re: Portable Headphone Amplifier: Volume Pot Problem...

    It seems to me that the amp is too sensitive even with the added negative feedback. But adding more feedback might cause instability. I suggest reducing the signal strength at the input side by...
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    Closed: Re: Name of this connector?

    I don't have one with me right now. I'll take measurements when I can.
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    Closed: Name of this connector?

    This connector is commonly used to connect the output of a monitor backlight inverter to the light itself.
    Does anyone know either the common name (like VGA, phonojack, etc.) or a formal one (like...
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    Closed: Re: Tiinned copper wire and screwless connector

    It's a well established fact that crimped and screwed-on connections involving soft metal such as solder and aluminium tend to loosen after some time. It can be caused by thermal cycling alone even...
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    Closed: Re: Tiinned copper wire and screwless connector

    Your description of the connector is vague, so it's difficult to judge. In general, solderless connections rely on friction and mechanical pressure to maintain electrical contact. If you tin the wire...
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    Closed: Re: Favour needed for instrument calibration

    Yes, I'm willing to send the parts anywhere in the world. In fact, I mentioned that in my first draft but then edited it out. I'm not in a big hurry and can send them by inexpensive ordinary parcel...
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    Closed: Favour needed for instrument calibration

    I don't have high-precision measuring instruments and have to rely on the manufacturer's specifications for judging the accuracy of my measurements. There's no place where I can take or send my...
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    Closed: Chinese LED replacement for monitor backlight

    I cannot find a replacement CCFL for my BenQ G2420HD monitor and am thinking of using one of those cheap Chinese LED kits like this one: https://tinyurl.com/y8gowz3z

    Has anyone used one of these...
  14. Closed: Re: [Moved]: How to remove glitches at the output of brown out detector?

    Yikes! It's going t take some effort to reverse analyze that. Can you give a quick run-through of how it's supposed to work?
  15. Closed: Re: [Moved]: How to remove glitches at the output of brown out detector?

    Can you post a schematic of what you've designed so far?
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    Re: Edaboard Poor Performance

    I've been away for quite a while, only checking in occasionally during that period. The first thing I noticed on coming back was the blank pop-up mentioned by others. A more important issue is that I...
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    Closed: Re: Better and worse LM386M amplifiers

    And the point of all that is......?

    The OP asked a straightforward question but your reply went off at a tangent. The LM386, like many many other products, was designed to fill a niche and it does...
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    Closed: Re: Better and worse LM386M amplifiers

    The OP did not mention striving for hifi quality or high power. The LM386 was designed and introduced by NatSemi, one the most respected manufacturers of analog ICs. It has been copied by other...
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    Closed: Re: Coin operated open air photo booth

    A cooling fan will take away most of the heat generated by the equipment. Heat absorbed from the sun's rays is something that needs to be seriously considered, especially when the air temperature is...
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    Closed: Re: Generating Synced Pulses

    The problem with that as a solution is that the OP wants to work with a wide range of frequencies and pulse widths, but he's reticent about details. With some posters asking for help, those who are...
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    Closed: Re: Generating Synced Pulses

    The OP mentioned Arduino and he probably has an Arduino Uno R3 as this is very popular with beginners. It uses an ATmega328P running at 16MHz. I'm no expert myself with Arduino or MCUs in general but...
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    Closed: Re: Generating Synced Pulses

    Your statements seem to contradict each other. The first sentence says you don't want software to generate the pulses, but the second sentence says you want software to control it and that the uC...
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    Closed: Re: Generating Synced Pulses

    The basic idea is to assign three different pins for each output and write a sketch to make them put out a pulse at different times, with a delay between each pin.

    Many pieces of information are...
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    Closed: Re: Choosing between two magnet arrangements

    I anticipated that and it's why I'm making a PWM speed control to run it at optimum speed for each operation.
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    Closed: Re: Choosing between two magnet arrangements

    Thanks for your interest. Your thoughts agree with mine, but since my recollection of magnetics is rather fuzzy, I was going by intuition and common sense. I couldn't be sure and was looking for...
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