If you are interested in ELF listening (whistlers, dawn chorus, tweaks, etc.) you will most certainly want to see Karen's new Humnuller that works on a PIC...
Eric, I know this is a little late, but I've had good results recently using a Xicon 42TM114 audio transformer for a 900VDC supply I designed and built. If...
Thanks, Craig. I basically already settled on Charles' circuit that uses the inductor instead of the transformer. Haven't had time to construct yet, but have...
Hello. I'm curious as to if any one has seen or used shortwave radios (walkie talkie) style similar to the frs/grms radios sold today? Granted the 16m to 49m...
People have built HF radios into a walnut shell so yes they do exist. Range wise, the number of factors to consider is high. You would have to use something...
Thank you for the reply. ... have to use something like ... performance and what is reported on the state of the ionosphere to get a good guess at the range. ...
I was just going to E-mail, if you let us know what you want to accomplish, most people that look at these e-mails would love to help with any information and...
Hi. I'm glad i looked in . I'm not getting notifications. 25 miles or 41km would be the maximum limit. That estimate includes some leeway. As for the cell...
The california highway patrol still uses 39 to 45 MHz in rural areas, but that's with a decent sized antenna and more power than a handheld. I really don't...
Hello, I have been looking at the op-amp audio amplifier on techlibs here http://www.techlib.com/electronics/audioamps.html. I understand the central ...
In order to get zero volts out of the second op-amp when there is a common-mode voltage, you need a little gain on the negative input. If you just connected...
Thanks for the reply, I have read this several times over and I think I get it but it it raises some other questions. My understanding is that (tell me if I am...
You could do that but the impedance of one side would be a bit low. The four-resistor, single op-amp circuit exhibits impedance on the positive side that is...
Hello and thanks for the help. I ended up going back to CB Radio, since i already have all the CB equipment and 22.5 foot base antenna. Adapting a privacy...
is it possible to convert vcd player into a dvd player with any changes in the circuitry of the vcd player??????.......... i have panasonic vcd player/........
Hi you can change vcd to DVD while changing the card type and also lens that CDM of suitable type card must be preferable or suited to the panasonic then only...
Hi , do u want to make a normal CD player or to change CD to DVD be brief in your queries Awesh H. Shaikh ... From: faiyazuddin mohd <hyd2faiyaz@...> To:...
Hi! I found a sealed lead acid (12V, 7Ah) from a no-break and I want to charge to test it. I have a cheap car batery charge - a 60W lamp with a diode, plugged...
It is hard to understand how 1/2 amp (maybe a bit more) would cause the battery to rapidly heat. The lamp, diode and battery are all in series, right? The lamp...
Yes, it they are in series. At start, the lamp is off and goes lightinig slowly. I put a multitester and read 34 amperes, then I turned off immediatly (I was...
I can't imagine how you measured 34 amps unless you connected the meter incorrectly! Could you describe the hookup in detail. A 60 watt lamp should limit the...
Maybe it's a 60 watt 12 volt bulb ? This charging arrangement is potentially lethal and I cannot recommend its use under any circumstances. charleswenzel...
Sorry, I made a mistake with the multimeter. I put the probe in the DCV socket and selected DCA in the dial and it REALLY diplayed 34A. With the right...
Hello. Locally cordless phone batteries (battery packs) are expensive beyond belief and that includes nicads. I was wondering if any one has made or seen a...
My older cordless phone uses NiCads and you wouldn't want to mix technologies because a typical NiCad charger will ruin NiMH batteries. Otherwise, I don't see...
Something it wrong with our DNS so you will be seeing a pretty old version of techlib.com until we find the problem. At least the old server still has...
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