- USB oscilloscope for troublshooting? - 3 Updates
- cheap solder smoke filter or overkill? - 2 Updates
- Denon DMD-M10 minidisk recorder - 3 Updates
| bob prohaska <bp@www.zefox.net>: Apr 21 01:05AM From time to time it'd be really handy to have an oscilloscope. Something like a Tektronix TDS2010 would be very nice. Too nice, and expensive, for as often as I'd use it. And, much too good for the sorts of things I'm likely to measure. An example would be watching for power supply sags during computer boot-up, or maybe disk spin-up. Basically audio bandwidth, but with the ability to capture transients by stop trigger. What about "oscilloscopes" based on USB sound cards? The one that's handy is xoscope, available via apt on RasPiOS. It's installed, but the man page gives no hint what sort of sound device, or general purpose A/D converters, are supported. I don't have a hard-and-fast performance requirement, nor one for price. It'd need to work from below 60Hz upwards, and cost around $10/kHz or less at higher bandwidths with a cap in the $200-500 range. DC response would be nice but not essential, calibrated amplitudes aren't really necessary but would be convenient. Possibly the biggest constraint is that I do not own a Windows license and have no modern Windows-compatible hardware, so the choices are MacOS 10.7.5, RasPiOS or FreeBSD only. If anybody has experiences or suggestions for devices and software to consider please post. Thanks for reading, bob prohaska |
| Ralph Mowery <rmowery42@charter.net>: Apr 20 11:31PM -0400 In article <s5nton$nrq$1@dont-email.me>, bp@www.zefox.net says... > less at higher bandwidths with a cap in the $200-500 range. DC response > would be nice but not essential, calibrated amplitudes aren't really > necessary but would be convenient. Possibly the biggest constraint is If you are going to spend 200 to 500 look at the Hantek scopes for around $ 350. https://www.circuitspecialists.com/hantek-oscilloscope |
| Kerry Imming <kcimming@pobox.com>: Apr 21 07:22AM -0500 On 4/20/2021 8:05 PM, bob prohaska wrote: > consider please post. > Thanks for reading, > bob prohaska I have a Rigol DS1100 and have been very happy with it. The auto signal find option makes it MUCH easier to use than the old scopes. https://www.tequipment.net/Rigol/DS1102Z-E/Digital-Oscilloscopes/?b=y&v=7906 - Kerry |
| JJ Lark <cbr6850@nospamverizon.net>: Apr 20 01:00PM -0400 Worked out well. Ran the box fan at both medium and high speeds with the filter across the front. I'm a little hesitant running the fan at max for extended periods because it seems like the filter constricts the input air flow. In any case, I did soldering, heat shrinking with matches since my lighter ran out of fuel, and even marked some wires with nail polish. No trouble at all. I expected the most lingering smell would be the nail polish, but even that I could barely detect. For $13 and the cheap box fan I already had, job well done! |
| Stephen Wolstenholme <steve@easynn.com>: Apr 21 12:53PM +0100 On Sun, 18 Apr 2021 10:07:59 -0400, JJ Lark >https://www.walmart.com/ip/Filtrete-20x20x1-Allergen-Plus-Odor-Reduction-HVAC-Furnace-Air-Filter-1200-MPR-1-Filter/36728389 >Appealed to me since it already has built in charcoal filter as well. >Won't be tested until this week. Thoughts? When I was 16 I had a job in a TV factory. The PCBs were soldered by floating them on solder baths. There was no sign of any smoke. Soldering the components that had to be mounted by hand produced a small amount gray smoke that was sucked up a vacuum pipe next to the soldering iron. Almost everyone worked without the pipe because it got in the way. Steve -- http://www.npsnn.com |
| Lucifer <LuciferMorningstar@bigpond.com>: Apr 21 09:41AM +1000 I have a Denon DMD-M10 minidisk recorder that will not play disks recorded on other machines nor will it record on a disk that has been used before. I was able to record on an unused disk which does play. |
| The OP is Lame <lame@lame.lame>: Apr 21 01:06AM > I have a Denon DMD-M10 minidisk recorder that will not play disks > recorded on other machines nor will it record on a disk that has been > used before. I was able to record on an unused disk which does play. And....? Try asking a question next time. |
| dplatt@coop.radagast.org (Dave Platt): Apr 20 06:09PM -0700 In article <1kpu7ghcagbut46ti8sic77sjd9vuumodp@4ax.com>, >I have a Denon DMD-M10 minidisk recorder that will not play disks >recorded on other machines nor will it record on a disk that has been >used before. I was able to record on an unused disk which does play. At a guess, I'd suspect that it might be any of the typical faults which can develop in any laser-optical-based disc recording and playback system: - Deteriorating laser (lower output level) - Dirty laser or read-back optics (dust, tobacco or cannabis smoke particles and tar) - Dirty or poorly-lubricated "sled" on which the optical assembly moves - Misadjusted servo tracking system Power-supply problems e.g. deteriorating filter capacitors, loose cables, intermittent contacts, etc. can also be a problem as these devices age. None of the above is at all specific to your recorder model. If you're serious about trying to fix it, I'd suggest getting the model-specific service manual (there's one up on eBay from a seller in Florida - no connection). |
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