Could anyone give me thoughts on this used frequency counter (and it's price) that's available locally (no shipping charges)? I'm a total n00b with 3 different projects on the go (though stalled due to lack of time). 2 of the 3 could benefit from a frequency counter with this range. I don't...
I just realized I forgot to respond to the last 2 posts. Thanks, audioguru, for the clarification. That helps with my confidence in the transmitter (I wasn't sure if the transmitter or the receiver was the problem).
And thanks for all your help codyhtml. If you don't get around to it, I...
If I do find some money for a desktop, I've got a friend who builds them and gets his parts at wholesaler prices. So I'm good there.
I'll have to see what I can get then for caps. I've been using ceramic. :-[ :-[
And I'm an idiot. I knew that 72Hz - 41KHz range sounded wrong. I calculated again and it's actually 41KHz to 72KHz. Duh. So I added another resistor and a value of 9.18 Kohm should give me 38.1Khz. I think that should be plenty close enough to the ideal frequency. But I tried it and the...
That's a pretty good idea. I'll see if I can dig up the old set of instructions for a probe...
It's so frustrating not knowing if my transmitter or receiver isn't working. I just calculated the frequency using the ACTUAL values of the resistors and capacitor, as measured by the DMM. The...
Um, the smiley seems to indicate a joke or a gloat. At the risk of sounding stupid, does it really have one like I would expect (a readout that says XXXKHz) or are you indicating that all you need to determine frequency is to know the resistance/capacitance values?
Please explain to the dumb...
The signal is from a 555, so I think that means it's square-wave. A good suggestion. I'll keep it in mind.
From what I understand, the highest frequency which a sound card scope can identify is based on it's sampling rate. I've got 3 computers - 1 good laptop, 1 crappy PC and an old junked...
I'm building an IR transmitter and receiver. I'm a newbie, working from untested plans, and am still making quite a few mistakes.
The transmitter is based on a 555 in astable mode. I would like to make sure it works and is at least in the same order of magnitude as the desired frequency...
I think your system and my planned one are orders of magnitude apart in terms of cutting power. ;)
I guess I was making it more complicated than it needed to be.
Out of curiosity, what's "stronger"? Mine are extremely wimpy. I have my fingers crossed that they will cut foam. I'll be ecstatic if they'll cut wood.
Hi,
Newbie here. I've been thinking of building a cnc mill for foam for a year or two now. I bought all the stuff for this board over the last year and stuff for a simple metal detector. Doing the metal detector now, as I've never made a pcb before. Will be starting the mill within the month...