T&L Publications

Alright guys, you know what time it is. Let's all search through our scrap bins and see what we can do for each other.<p>Here's what I have up for grabs/trade:<p>1 T.I. TMS320F240PQ DSP chip w/FLASH in 132-pin BQFP package 1 T.I. TMS320F241FN DSP chip w/FLASH in 68-pin PLCC package 3 T.I. SN74ACT222...

The resistors will be very hot, notice my closing statement of "Happy Heating!" in the above post ;) .<p>The four diodes in the sequencing circuit would be the "bridge rectifier", and that turns the positive and negative 60Hz AC signal from the wall into a positive-only 120Hz AC ...

How did you connect the diodes in the circuit?? Did you connect them just across the terminals of the power supply? As if it were in place of a bulb??<p>If so, there would be a tremendous amount of current running through them. If my Mental Fuzzy Math is right, I'm suprised you didn't blow the diode...

Yes of course, high resistance value. Wouldn't want to blow up the diodes that I'm trying to measure the voltage of!! :p <p>~Kyle

Well, this is by far a much more ambitious project than you might think. It can be done, but I think it's going to be hard.<p>First of all, it would be easy to create an ultra-sonic one-way communication system. You speak of 2-digit numbers, so we're talking about 7 bits of transmission, allowing yo...

Alright, thanks for the prompt response, I'll wire it up today when I have the chance.<p>~Kyle

Is it possible to create a meter that would indicate the voltage of a Zener diode? I find myself with countless amounts of un-labled zeners and I can't use them, because I don't know the voltage of them.<p>Thanks,
~Kyle

I see...they don't release the code to the public....oh well then, thanks for the link, it gives some inspiration for my own PIC code.

Not sure if this is what you're looking for, but I do have a schematic for a motor H-Bridge with 8 transistors (4 darlington, 4 small-signal drivers).<p>Truth table:<p>input | output A | B | A | B --------------- 0 0 | float 1 0 | 1 0 0 1 | 0 1 1 1 | 1 1<p>There are two output terminals, A and B, an...

Dim bulb,<p>Do you have the PIC code and schematic for that great-sounding meter you speak of? That would be great, just as a fun project to build.<p>Thanks,
~Kyle

This should help you out a good deal:<p> R1 MIC----------/\/\/\/----------------V+ | | | --+ | -- C1 R2 | |-------/\/\/\/---------------GND GND | |-----------------------------Output<p>R1: 10k R2: 1M C1: 100uF V+: 9V (you can use a 9V battery)<p>Output is taken from the Output terminal, and your met...

I do think a really good way would be using transistors, like I said earlier.<p>If you want to use a bunch of resistors in parallel and series, then AllElectronics would be a good source. They are really inexpensive for those types of things.<p> www.allelectronics.com <p>4 TIP140 NPN transistors cou...

Not sure if anybody can help me out here, but it's worth a shot.<p>I have an old Sony CCD module, and I'd like to interface to it. I have no idea whatsoever where to begin. I have all the support chips for it, and all the parts I have for it came from an old camcorder circa 1985.<p>Has anybody ever ...

I would just recommend creating a really long boolean-algebra statement, and implementing it with logic gates.<p>Something like: output = !A * B !(!C*D(E^!F))<p>A,B,C,D,E, and F are your key-code inputs, and when you press one of them, it would run through a schmitt trigger for debouncing and then t...

So you know, the reason you get 4.2V from just the two contacts of the wall-wart is that in a power supply circuit, the voltage is slightly higher when there is no load (resistance across the contacts). The meter has an extremely high load (resistance) across the contacts, so it can give you an accu...