well! i have the circuit built for the basic lightning receiver, lamp, and 100 ua meter.. and ive connected 9 LED's to an LM3915, and had a go at connecting...
Here are a couple of pictures of the project :) http://www.gtechdesigns.co.uk/pic1.jpg http://www.gtechdesigns.co.uk/pic2.jpg ... lamp, ... a go ... LM3915.. ...
That looks fine but you will need to increase the 1k in the bottom leg of the meter to 12k in order to get 1.2 volts instead of 100 mV for a certain level of...
Ok thanks Charles, il add 12k's to the shopping list. looking at the datasheet it says i need 1.24k Resistors 8.06K resistors Which sound like strange values...
I don't think you want those resistors; they're for a 10 volt full-scale input. I think you want to connect pin 6 to pin 7 (REF OUT to REF HI) and connect pin...
Look down the data sheet for the "vibration meter" application. ... OUT ... current. ... and 8K ... bottom ... for ... receiver, ... and ... would ... on ... ...
ah great, looking forward to switching it on for the first time.. and then waiting months for a thunder storm lol ... not ... <charles@> ... mV ... the ... ...
Using this schematic http://www.gtechdesigns.co.uk/schem.jpg i would like to connect a speaker to it with a volume control. would anyone know of a circuit i...
The first circuit at http://www.techlib.com/electronics/audioamps.html should work. You can probably leave out the capacitor between pins 1 and 8 since you...
Hullo all I have a universal motor which is used to run a centrifuge machine. Originaly this machine was made to run on 110VAC but mistakenly it was pluged to...
... machine. Originaly this machine was made to run on 110VAC but mistakenly it was pluged to a 220VAC and it smoked. When i oppened the motor the amature...
Hello builders! I am attempting to use the CAB on the techlib.com site as an amplifier to raise the level of a sine wave from a function generator to generate...
Have you tried the amplifier with a resistive load? My first thought is that the transformer secondary is a nasty load. It does seem like 500 Hz would do the...
Just for fun I built this CAB circuit and tried it today. Using junkbox parts, 2N3740 and 2N3441 for the output transistors. I used dual 470uF output caps from...
... Replacing the transformer with a 15 Ohm resistor to ground shows no difference in waveform/clipping point as far as input level is concerned. Output...
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... As an aside, of all the possible junk box filament transformers Steve might have had in his junk box, and chosen to use, his choice happens to be the same...
Hi Joe, and anyone else who is following this thread, I did some more experiments today. Changing the input coupling cap from 10 uF to 1000 uF, and changing...
... I'm not sure that I understand what's going on in your Output coupling setup. What is the difference between a DC block from the center of the 2 emitter...
The maximum output occurs when taken directly from the emitters; for these audio amps where the emitter resistors are small values, it doesn't matter much if...
I wonder what would happen if you selected a couple of back-to-back electrolytic caps to place in series with the secondary to resonate with the transformer....
Hi all I want to learn how to calculate the number of turns and wire guage that should be wound on a given transformer or inductor core using a given voltage....
... guage that should be wound on a given transformer or inductor core using a given voltage. Thanks ... Dennis, there isn't any easy answer to your question....
Hey all, I have a universal motor that I use to run my home made centrifuge machine. It is using 115VAC 2.6Amps but its speed is constant yet I want this speed...
Ive never worked with mains voltage in electronics before. I've wired houses, installed alarm systems etc, but never played around with switching appliances...
Those relays look fine but I would prefer a double-pole type. Here are a couple of pointers: 1) Either put the gadget in a metal chassis with the line voltage ...
Does anyone have a circuit or suggestions for an automatic vacuum switch for saws and other power tools? That's a box that the saw plugs into, it has a second...
... switch for saws and other power tools? That's a box that the saw plugs into, it has a second outlet that is switched on when it detects the saw is running,...
I actually had given some thought to something along these lines a while back. Some kind of simple current transformer and then something to drive a relay was...
