audio probe for smt circuits

Started by bitrex in sci.electronics.design6 years ago 3 replies

So I want to work on diagnosing the Monotron noise issue i mentioned in a post here a while back bit in my free time. I'd like to have...

So I want to work on diagnosing the Monotron noise issue i mentioned in a post here a while back bit in my free time. I'd like to have something to probe points in the circuit and have my hands free while I look and listen on an amp and oscilloscope. What kind of probe do you use to connect to those tiny little traces on a production board and hold it there while you do this? ...


problem with the Interpolation algorithm

Started by Francesco Poderico in sci.electronics.design9 years ago 15 replies

Hi all, I'm trying to design a DIY oscilloscope that can be connected with a PC and I want to be able to display signal at frequency as higher I...

Hi all, I'm trying to design a DIY oscilloscope that can be connected with a PC and I want to be able to display signal at frequency as higher I can... (in theory fs/2). I'm sampling at 100 MSPS with an 8 bit ADC, 45 MHz bandwidth. Eventually my plan is to achieve 200 MSPS. I'm having problem trying to interpolate the input data from a 2 kbyte buffer and please visit my blog to see the ...


oscilloscope and waveform generator combo recommendation

Started by scot in sci.electronics.design9 years ago 9 replies

Anyone have a recommendation for an entry level oscillscope and waveform generator? I was looking at Saelig and they have a Rigol combo for ~$850...

Anyone have a recommendation for an entry level oscillscope and waveform generator? I was looking at Saelig and they have a Rigol combo for ~$850 and also an Owon combo for ~$700. Both scopes are advertised as 100 MHz. Scot


scope for hobbyist who hopes to eventually design circuits

Started by Winfield Hill in sci.electronics.design7 years ago 51 replies

One of our new AoE readers wrote, asking: > Hi- I'm just getting started in electronics, and am > looking for a recommendation for an...

One of our new AoE readers wrote, asking: > Hi- I'm just getting started in electronics, and am > looking for a recommendation for an oscilloscope to > use to complete the labs in your student manual. > I'm a hobbyist who wants to learn more and perhaps > design some circuits eventually. > > I've read that there are some good-quality PC-based > oscilloscopes that are less expensive than


1965 Allied Catalog

Started by John Larkin in sci.electronics.design4 years ago 45 replies

Ungar soldering iron 98 cents KG2000 oscilloscope kit $199.50 (all tubes, 5 MC, triggered sweep, DC coupled... I had one) 1%...

Ungar soldering iron 98 cents KG2000 oscilloscope kit $199.50 (all tubes, 5 MC, triggered sweep, DC coupled... I had one) 1% axial resistor 54 cents 10% carbon comp resistor 13 cents 1N914 diode $1.50 2N2222A $6.75 12AX7A $1.28 The dollar-value adjustment is about 8:1. So the cost of gumdrop parts is now hundreds of times less than it was then. My all...


Test points for dense boards

Started by Ebi in sci.electronics.design10 years ago 32 replies

Hello, Over the years the boards that I design become more and more dense with com= ponents on both sides of board and even thinner tracks and...

Hello, Over the years the boards that I design become more and more dense with com= ponents on both sides of board and even thinner tracks and smaller vias tha= t are too close to each other. that has made assembly and quality control= more difficult. sometimes technician needs to read voltage from a small v= ia and oscilloscope probe or multimeter lead slips and short circuit to poi= ...


positive response from noise input

Started by captoro in sci.electronics.design7 years ago 4 replies

Hello All, Making a project where I need to turn on a led when there is a glitch on my= RF C.B. Most often the noise I receive is on the...

Hello All, Making a project where I need to turn on a led when there is a glitch on my= RF C.B. Most often the noise I receive is on the negative side (-100mv to -2v) as s= een on the oscilloscope. I am using an opamp to amplify the voltage to usab= le level. What I need to do is to invert the negative noise so I get the po= sitive and negative voltage so I do do not 'miss' any spikes. I o...


Purposely lossy coax: How to determine resistance?

Started by Joel Koltner in sci.electronics.design10 years ago 18 replies

Hi guys, As most peple here are likely aware, if you examine the coax cable for a passive oscilloscope probe you find that the inner...

Hi guys, As most peple here are likely aware, if you examine the coax cable for a passive oscilloscope probe you find that the inner conductor is made of a highly resistive wire -- something like nichrome, and around 50-200ohms per meter. (For some background on this, check out this article: http://www.dfad.com.au/links/THE%20SECRET%20WORLD%20OF%20PROBES%20OCt09.pdf ). What's no...


Manual or datasheet for old ECG equipment from HP

Started by Joerg in sci.electronics.design9 years ago 2 replies

Hello All, Does anyone know where to obtain data for this old ECG stuff: HP console: 78901A ECG: 78213C Neonatal Monitor Oscilloscope...

Hello All, Does anyone know where to obtain data for this old ECG stuff: HP console: 78901A ECG: 78213C Neonatal Monitor Oscilloscope Monitor :78304A Not the same but looks similar: http://www.recycledgoods.com/zoom/14936 Reason is I'll have to interface to that during a test. I was told the ECG output signal which I'll need comes out on a BNC and is 1mVpp in amplitude. Doesn't ...


Agilent 62Ghz scope Demo and experiments

Started by amdx in sci.electronics.design8 years ago 12 replies

A few of you, very few, may want to drewl over this bleeding edge...

A few of you, very few, may want to drewl over this bleeding edge scope. http://thesignalpath.com/blogs/2013/08/13/experiments-and-demo-of-an-agilent-dsa-x-96204q-160gss -62ghz-oscilloscope/ Mikek


Tektronix field adjust software TDS400A

Started by Anonymous in sci.electronics.design4 years ago 7 replies

I'm in process of repairing an old TDS420 oscilloscope and have been searching in vain for the Field Calibration Software for this scope. I...

I'm in process of repairing an old TDS420 oscilloscope and have been searching in vain for the Field Calibration Software for this scope. I have the cal sw for the 500, 600, and 700 series but not for the 400 series.... yes I have contacted Tek they claim to not have it and I only found one site that claims to have it at a cost of almost $10,000.00 <


Dispersion in Coax

Started by George Herold in sci.electronics.design3 years ago 47 replies

Hi All, this is a question from a physics demo group that I'm passing on to you. Here's the question. One of my prof's want to do a...

Hi All, this is a question from a physics demo group that I'm passing on to you. Here's the question. One of my prof's want to do a demo where you input a square wave into a very long coax cable and look at the output of the cable with an oscilloscope to see that the high frequencies are traveling faster than the low frequencies. Anyone in Tapper land do an experim


Late 1970s SMPS Design Query

Started by Cursitor Doom in sci.electronics.design6 years ago 182 replies

Gentlemen, May I draw your attention to this schematic for what I believe is termed a "resonant converter" (the power supply section from...

Gentlemen, May I draw your attention to this schematic for what I believe is termed a "resonant converter" (the power supply section from an old boat anchor oscilloscope) - https://www.flickr.com/photos/128859641@N02/24535280896/in/dateposted- public/ Can some kind soul explain the workings of the dozen or so components labelled "Function: resonance circuit"? I'm completely unfam...


Tektronix 7633 o'scope

Started by Anonymous in sci.electronics.design4 years ago 17 replies

I've recently gotten hold of a Tektronix 7633 oscilloscope but can't seem to get a trace or any kind of waveform on the crt. Was wondering if...

I've recently gotten hold of a Tektronix 7633 oscilloscope but can't seem to get a trace or any kind of waveform on the crt. Was wondering if I'm doing something wrong , not doing something right , or is the scope in need of repair? Is the repair complex ( I know my way around a soldering iron ) or should I just sell it for parts. It came with three plug-ins : Dual trace amplifie


Some oscilloscope pictures

Started by Sylvia Else in sci.electronics.design3 months ago 25 replies

Shows how the power transformer is directly wired to two separate boards. Not sure how, or why, they'd want to do that. Shows the...

Shows how the power transformer is directly wired to two separate boards. Not sure how, or why, they'd want to do that. Shows the hole through which the transistor has to be soldered. Note the two resistors in plastic tubing that have one end so


High speed pulse generator to test oscilloscope

Started by Anonymous in sci.electronics.design8 years ago 12 replies

Greetings I have a Tek TDS694C I will be selling, and I'd like to demo it's high speed performance by showing it detecting a rise time - I'm...

Greetings I have a Tek TDS694C I will be selling, and I'd like to demo it's high speed performance by showing it detecting a rise time - I'm trying to remember exactly what that is - somewhere in picosecnd range? Is there a chip which will show a fast rise time? I believe they use some kind of high speed fpga? thanks in advance jb


DC coupled oscilloscopes!

Started by John Larkin in sci.electronics.design8 years ago 3 replies

http://electronicdesign.com/test-amp-measurement/today-s-oscilloscopes-tackle-evolving-communica tions-standards "While the upper-frequency...

http://electronicdesign.com/test-amp-measurement/today-s-oscilloscopes-tackle-evolving-communica tions-standards "While the upper-frequency limit of an oscilloscope does determine price, the lower-frequency limit is also worth noting since it can affect the instrument?s effectiveness for some measurements. Some measurements, such as electromagnetic-interference (EMI) testing, require a me


Analog Oscilloscope - Unknown Problem

Started by Robert Stevens in sci.electronics.design6 years ago 13 replies

I have a Kenwood dual trace CRO that appears to be in good working order. Each channel works fine independently, but when I cannect the...

I have a Kenwood dual trace CRO that appears to be in good working order. Each channel works fine independently, but when I cannect the probes one each to two points on the same circuit (ref to common ground) something that looks like low level oscillation appears on channel 2. I tried swapping the probes, both between channels and test points. The result is always the same, and alway...


Oscilloscopes and signal "ranging"

Started by RogerN in sci.electronics.design8 years ago 9 replies

I'm wanting to experiment with circuits for signal conditioning, like precision rectifiers and auto ranging to best utilize the span of A/D...

I'm wanting to experiment with circuits for signal conditioning, like precision rectifiers and auto ranging to best utilize the span of A/D converters. Is there a name for the type of circuit that multimeters use to select ranges or auto-ranging? Also I'm looking for an oscilloscope that would let me look at the signal in and signal out to make sure I'm getting the signal my circuit is...


T904 board

Started by John Larkin in sci.electronics.design2 years ago 5 replies

Here's another big board. https://www.dropbox.com/s/bfepc9wsaxwgs8p/T904_PCB_1.JPG?raw=1 This is the main part of a test set to production...

Here's another big board. https://www.dropbox.com/s/bfepc9wsaxwgs8p/T904_PCB_1.JPG?raw=1 This is the main part of a test set to production test a laser controller. Upper-left is a MicroZed, which is the compute/FPGA and communications bit. Upper right are a couple of the cute LTM switcher bricks. This connects to the DUT, an oscilloscope, a DVM, and a Keysight counter, so there's ...