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right.. i *did* previously realise that in the v=ir equation, smaller values of r would mathematically increase v, and larger would increase :) i'm waay shagged out, and haven't got any results any

okay, v=ir, right. i've tried using resistors rated at a fraction than an ohm, but i'm not getting any increase in voltage, and all the amplifier info i can find uses a 'signal' voltage and a

I recall a book called 'Electronics 101'. Is it still availalbe? Where can it be found (online store?)?

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Cool. Glad to have been of help, even if I barely had a clue :) Anyone know how to quieten a switching power supply for use in audio circuitry? I have a cheapy power supply laying around, and am

Funnily enough, your comment re the true earth provided the answer, thank you. I rearranged it, and it works like a dream. Arcane it may be, but it works very well:-) I thought the design looked

"Dominic Rivron" <karen.rivron@...> sez: Wow. Truly bizarre. I am too new to all this to comment usefully on such an arcane construction...what the hell is that transistor on the inputs for?

Darren Reid wrote: Thanks for this (and thanks to Joshua too. The amp in question is part of: http://www.radiohc.org/Distributions/Dxers/dsratregen.html Dominic --

Hmm. Did you build it straight from the app notes, or some other schematic? Can you point us to the schematic you used, somewhere on the web? The hiss might be from lack of a true ground... I'm new

Hi all Great site, and just about at my level being fairly new at this game. I am a pretty keen radio monitor on both VHF and UHF as well as HF. I am very keen to get my hands on a circuit for a

If I'm not mistaken, there's a +15V gain on the LM386.... I think I read this from National Semiconducter's PDF file on constructing sine wave shapers...look on google, in the PDF file there's a

I've just built an audio amplifier using an LM386, and found that though it amplifies, there is an annoying level of backgound hiss, irrespective of the volume setting or input. Also, it tends to

Ges-Lab Indonesia We are Concerns & Focus -------------------------------------------------------------------------------- I need a simple schematics for tester/Cheker component for; -

There are a lot of different ways to do this. You can spend a lot of money and not so much time, or a lot of time and save some money. PLCs (Programmable Logic Controllers) are well suited for this

Check out http://www.mouser.com. I did a search using 'weller' and 'soldering iron' and there was a really big list of items. I don't know if they have a 12 volt version. It would be worth checking

Hi I am a new guy here and to electronics. But I'm hoping to learn enough to complete some projects I have in mind. I'm interested in setting up a system that will control a vivarium temperature

I didn't see an answer to this. But, mail has been slow through my server today. so forgive me if this is a repeat. "Rails" is a term that refers to the power supply voltage, often times on a

a friend of mine is looking for a weller 12 volt soldering iron and the serch hasnt turned up anything. if any one knows where to order on it would be a big help. 73 kb9yet

Unless I'm mistaken (I'm still learning here), the rails are the maximum and minimum voltages the amplifier can go to. Whether it's single ended or double ended (one transistor, or two doing push

What does "rails" mean? For example: "5V at the rails" "rail to rail amplifiers" "As for current delivery, most will do a few milli-amps, but typically not near the rails" "an opamp with a