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October 13, 2024, 03:41:13 PM

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#1
The Newcomer's Forum / Re: I thought I would filter s...
Last post by saturated - Today at 02:59:43 PM
Yes sir thanks

Before I post the picture I am aware that I have struggled mightily trying to remember that a scope probe and ground clip are different than two leads on a multimeter

But here you go

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 :P
#2
The Newcomer's Forum / Re: Tone burst generator
Last post by saturated - Today at 02:56:45 PM
Yes sir thanks

Probably beyond the scope of this conversation (on my end) but I was hoping for like a brontosaurus type burst

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and I don't recall it ever being anything besides a uniform amplitude from beginning to end.

https://youtu.be/cAYDiPizDIs?feature=shared
#3
The Newcomer's Forum / Re: Tone burst generator
Last post by g1 - Today at 02:20:21 PM
"all it did was flip back and forth from a flat line to a sin wave"
Flat line is no signal, sine wave is burst, so it's doing it's job.
It could make bursts of whatever kind of signal you run in to it, square wave, pink noise, etc.
#4
The Newcomer's Forum / Re: I thought I would filter s...
Last post by g1 - Today at 02:13:10 PM
How about a schematic of the way you hooked it up?   :)
#5
The Newcomer's Forum / Tone burst generator
Last post by saturated - Today at 07:31:47 AM
Another new toy yay

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It's guaranteed to work because there was a sticker on it that said "checks ok date 1968"

I didn't have much luck with it it did power on I ran a sin wave thru it to my scope and when I turned knobs and flipped switches all it did was flip back and forth from a flat line to a sin wave.  Turning the knobs affected the rate.

Then I ran it into an amp and just got Morse code.  :loco

Help is otw though....I couldn't find a manual for this exact manufacturer model but did find a manual for a similar model gen rad.

Also I ordered some BNC to BNC cables to make life a little easier.   :grr

There is not much info I could find out there about these devices apparently they were used to test stuff that now they do the same testing with stuff that made these boat anchors...idk.  xP

I just want to get some cool looking stuff on my scope.   8|
#6
The Newcomer's Forum / Dude....I got this diode (true...
Last post by saturated - Today at 07:22:46 AM
And it's a biggun  8|

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There used to be a song on z-rock called "don't call me dude "
#7
The Newcomer's Forum / Re: I thought I would filter s...
Last post by saturated - Today at 07:05:08 AM
Btw I do know about the pi filters and stuff that use a capacitor as well and a certain frequency gets through because at the sweet spot frequency the reactances are equal and cancel out because of resonance, theta and Eli the Ice Man  :dbtu: because I worked a million of those problems  :'(

But I still thought a choke by itself would become restrictive at some point
#8
The Newcomer's Forum / I thought I would filter some ...
Last post by saturated - Today at 05:44:33 AM
So I encountered a device that looked like a transformer or a choke.  I didn't see enough wires for a transformer so I immediately concluded that it was a choke.  For some reason I decided maybe I can start out simple and measure resistance (hey why not  :duh )
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My ultimate plan was to run a sin wave thru it and start filtering like I read about in those books yay  8|
But then I ran into a problem
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Dude...is this the same as a choke ?!?!!?!?
 :grr
(Btw looks like we have some cool upgraded emoticons  <3) )

Oh well on with the experiment....dialed up some sin wave and connected it paying attention to Vp-p and RMS etc

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I then altered the frequency  :loco checking the scope for any changes....I did see a
reduction in amplitude but my generator only went up to 3 Mhz
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At higher frequency I found this adjustment helpful  :lmao:
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I also connected my multimeter across the DUT to monitor voltage drop wrt frequency and it did increase directly proportional to it but maybe my meter couldn't handle it when it got too high idk because it just got bigger then dropped to zero.

So at the end of the day perhaps I was seeing an attenuated (?) signal that was left over after the voltage drop (?)

At a certain frequency I did some maths and determined RMS from the scope and added it to my multimeter RMS but they didn't quite add up to what I had started with.

 :grr

The "results" were not what I expected I thought I would be able to vary frequency and there would be a range or ranges or a cutoff where no signal was getting through but I didnt see that at all.

Oh yeah btw if it helps....I did test it with this as well
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 8|
#9
Amplifier Discussion / Re: Off-the-shelf speakers for...
Last post by J M Fahey - October 10, 2024, 12:38:21 AM
Johan Segeborn tests this all the time.
Here is one of his videos.

Sadly, it involves a cheap amp and a (relatively) expensive speaker.

Even so .....

Result is *incredible*
#10
Amplifier Discussion / Re: Off-the-shelf speakers for...
Last post by Miyagi_83 - October 09, 2024, 11:48:53 PM
Yeah, I also have a Vox Pathfinder 10 and while the cleans are fairly acceptable, the overdrive is just meh. Maybe it's just me, but I can't dial a usable OD tone on that. I haven't plugged it into quality speakers, though, because that amp has no speaker out jack, so for now it resides in my basement, waiting for me to get some time on my hands so that I can give it some love.

Now, my buddy's son's Kustom KGA-16 that I had in for repair yesterday is surprisingly usable, even through the small-fry speaker inside. Especially if you consider the price tag on that little sucker - they paid the equivalent of under 40 USD for it, including shipping, in early 2022. Used of course. Moreover, it does have an external speaker jack, so I ran it through a pair of 12" drivers and, honestly, I wouldn't be ashamed of using it live.