sci.electronics.repair@googlegroups.com

Google Groups

Fox's Mercantile <jdangus@att.net>: Mar 20 08:35PM -0500 On 3/20/19 5:57 AM, J.B. Wood wrote: > I've been wondering what circuitry constitutes the time base > (what governs the 60 Hz AC output freq) in consumer inverter > generators (e.g. the Honda EU series)?   It would help if you gave us the model number. <https://powerequipment.honda.com/support/shop-manuals>       -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com

tabbypurr@gmail.com: Mar 20 06:49PM -0700 On Wednesday, 20 March 2019 14:56:16 UTC, J.B. Wood wrote: > for connection to a motor vehicle battery. So what component(s) control > the inverter generator's output frequency to the required degree of > accuracy? Sincerely,   Whatever components the designer chose to use in said oscillator. It could be anything, but a crystal is unlikely, they cost at least a penny more.     NT

"J.B. Wood" <arl_123234@hotmail.com>: Mar 21 06:35AM -0400 >> accuracy? Sincerely,   > Whatever components the designer chose to use in said oscillator. It could be anything, but a crystal is unlikely, they cost at least a penny more.   > NT   Hello, and I already addressed your other post. I think a crystal is probably likely. You said it was unlikely but don't offer sensible reason(s) why (e.g. temperature and vibration stability, etc) Lacking knowledge of the internals, you might ust as well have said "They use whatever they need to use". Not exactly an erudite response. Sincerely,   -- J. B. Wood e-mail: arl_123234@hotmail.com

"J.B. Wood" <arl_123234@hotmail.com>: Mar 21 06:40AM -0400 On 3/20/19 9:35 PM, Fox's Mercantile wrote: >> generators (e.g. the Honda EU series)?   > It would help if you gave us the model number. > <https://powerequipment.honda.com/support/shop-manuals>   Hello, and that's certainly reasonable but I was asking a specific question related to the technology and my guess is that the correct answer doesn't very that much between manufacturers. I have seen block wiring diagrams online but not detailed, circuit board schematics. Sincerely,   -- J. B. Wood e-mail: arl_123234@hotmail.com

tabbypurr@gmail.com: Mar 21 04:28AM -0700 On Thursday, 21 March 2019 10:35:28 UTC, J.B. Wood wrote:   > Hello, and I already addressed your other post. I think a crystal is > probably likely. You said it was unlikely but don't offer sensible > reason(s) why (e.g. temperature and vibration stability, etc)   cost, as I said.   > Lacking > knowledge of the internals, you might ust as well have said "They use > whatever they need to use". Not exactly an erudite response. Sincerely,   sorry to hear the reality doesn't meet your approval.

Ralph Mowery <rmowery28146@earthlink.net>: Mar 21 10:39AM -0400 In article <431efc04-6387-45f7-bbf8-66ee332ad28f@googlegroups.com>, tabbypurr@gmail.com says... > > probably likely. You said it was unlikely but don't offer sensible > > reason(s) why (e.g. temperature and vibration stability, etc)   > cost, as I said.   The cost of small microprocessors and crystals are almost nothing. Look at the Arduino processor boards. They can be bought from China for about 2 ot 3 dollars. They are powerful enough to run the inverter part of the inverter.

Fox's Mercantile <jdangus@att.net>: Mar 21 10:54AM -0500 Tabby just wants to find fault with everything.   -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com

tabbypurr@gmail.com: Mar 20 06:50PM -0700 On Wednesday, 20 March 2019 16:38:13 UTC, J.B. Wood wrote: > output frequency (e.g. 60 or 50 Hz +/- some acceptable deviation). So > the crystal has to remain reasonably stable in a variety of operating > environments. Sincerely,   why would they waste money on a crystal?     NT

"J.B. Wood" <arl_123234@hotmail.com>: Mar 21 06:26AM -0400 >> environments. Sincerely,   > why would they waste money on a crystal?   > NT   Hello, and what do you mean by "waste'? Microprocessors typically use a crystal as a timebase. While I appreciate all the responses to my OP, It appears no responders have intimate knowledge of the subject internal circuitry. If I did, I wouldn't have posted. The 50 or 60 Hz output of the inverter-generator has to be traceable/locked to some internal time reference, not the rpm of the engine. A crystal seems a likely candidate as I don't think these appliances have an internal cesium or rubidium clock :-) Sincerely,   -- J. B. Wood e-mail: arl_123234@hotmail.com

tabbypurr@gmail.com: Mar 21 04:29AM -0700 On Thursday, 21 March 2019 10:26:42 UTC, J.B. Wood wrote: > reference, not the rpm of the engine. A crystal seems a likely > candidate as I don't think these appliances have an internal cesium or > rubidium clock :-) Sincerely,   Welcome to the filter.

Adrian Caspersz <email@here.invalid>: Mar 21 01:33PM On 20/03/2019 16:38, J.B. Wood wrote: > output frequency (e.g. 60 or 50 Hz +/- some acceptable deviation).  So > the crystal has to remain reasonably stable in a variety of operating > environments.  Sincerely,   After a quick google, I found this paper.   Design and Construction of 1kVA Inverter http://www.ijeert.org/pdf/v2-i3/29.pdf   and also   250W PWM inverter circuit SG3524 http://www.circuitstoday.com/pwm-inverter-circuit     The mentioned IC SG3524 is primarily intended for DC-DC inverter designs, and the oscillator is programmable by values of R & C.   TI SGx524 Regulating Pulse-Width Modulators http://www.ti.com/lit/ds/symlink/sg2524.pdf   Although in the above two circuits, I see they set the oscillator lower (50Hz) than TI's spec sheet (Sec 7.7 , Fig 2)     Have a look around for SG3524 schematics. It's popular!   3 High Power SG3525 Pure Sinewave Inverter Circuits https://www.homemade-circuits.com/sg3525-pure-sinewave-inverter-circuit/       -- Adrian C

legg <legg@nospam.magma.ca>: Mar 20 08:17AM -0400 Bit of a sob story.   Looking for a quick electronic format service manual last Saturday - trying to complete a web purchase of that from samsungparts.com when their microsoft e-commerce gui goes bad ' cannot complete request' etc etc.   Send e-mail about this and get invoice for electronic format plus shipping ($x2). No service manual file in mail. I query further.   I need the manual that day. I get it after more searching, that day.   Response later - they only ship electronic format on usb stick or CD.   I tell them to keep their product and refund shipping costs that were never intended in the original purchase.   They ship four days (two business) days later, anyways.   Samsungparts.com - J&J International - stay clear of these jokers.   RL

legg <legg@nospam.magma.ca>: Mar 21 09:11AM -0400 >They ship four days (two business) days later, anyways.   >Samsungparts.com - J&J International - stay clear of these >jokers.   An automated message from paypal indicating the transaction was reversed. No notice from J&J. Perhaps I was a little too hasty in disparaging the organization. An odd mix of internet sales and 9-to-5. Microsoft e-commerce service also an unfortunate choice.   RL

jurb6006@gmail.com: Mar 20 10:32PM -0700 >"The fan is not for cooling. It is a mosquito trap and the fan sucks mosquitoes attracted by a chemical compound, heat and UV light. The fan must not stop or the mosquitoes will escape. "   When it STARTED to run with a blown bulb what happened ? It ran. So it should run again. However, if it is sending already upped voltage to the CCFLs a regular switch is not reliable.   Anyway, it sounds like this contraption is a light, a heater and a fan. Common power supply ? That is common. Correct me if I am wrong.   If I am not wrong I say in the very long run you might cost a little longevity running without that part of the load, but I say MIGHT. Not for sure. And it's not like it's going to fail overnight.   Don't sweat it.

HenryStecy <HenryStecy.16d8a5d8@diybanter.com>: Mar 21 01:24AM Absolutely with you it agree. In it something is and it is excellent idea. I support you.         -- HenryStecy

You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com.