This is a PGP signed message sent according to RFC3156 [PGP/MIME] --=_Turnpike_AqXPFHAHxq97Q4e1= Content-Type: text/plain;charset=us-ascii;format=flowed Content-Transfer-Encoding: quoted-printable In message <1005974601.2015972.0@cherry.ease.lsoft.com>, Automatic=20 digest processor expounds >Date: Sat, 17 Nov 2001 00:12:35 -0500 >Reply-To: pic microcontroller discussion list >Sender: pic microcontroller discussion list >From: Automatic digest processor >Subject: PICLIST Digest - 15 Nov 2001 to 16 Nov 2001 (#2001-326) >To: Recipients of PICLIST digests > >There are 102 messages totalling 4029 lines in this issue. > >Topics of the day: > > 1. [EE]: high-power generator/motor (9) > 2. [OT]: Making printed circuit boards with lazer printer (7) > 3. [EE]: RS423 vs RS232 (2) > 4. [EE]:Re: EGA to VGA converter (2) > 5. [OT]: Making printed circuit boards with lazer printer (= 2) > 6. [OT]: New type of Engineering degree > 7. [OT]: Dallas iButton (6) > 8. [PIC]: adresh&adresl registers. (2) > 9. [EE]: Modular enclosures (5) > 10. [EE]: CMOS transistor level design (2) > 11. [pic] programming 12c508 with 16f84 programmer > 12. [PIC]: 12C509A web server ???????????? (5) > 13. [OT]: Help with FM transmitter (4) > 14. [PIC]: Schmitt input problem 16F628? (2) > 15. [PIC]: Noisy relay switching in pic applications > 16. [EE]: Light Sensors (8) > 17. [PIC]Does anyone know of some logic circuits that would detect the > following situation? (3) > 18. [EE]Does anyone know of some logic circuits that would detect > the following situation? > 19. [PIC]:Does anyone know of some logic circuits that would detect > the following situation? > 20. [OT]:Refilling HP smart cartridges - The Answer! (2) > 21. [PIC]Does anyone know of some logic circuits that would detect > the following situation? (2) > 22. [PIC]:Does anyone know of some logic circuits that would dete ct > the following situation? > 23. [EE]Does anyone know of some logic circuits that would detect the > following situation? > 24. [EE] AD7829 problems > 25. [PIC]Does anyone know of some logic circuits that would > detect the following situation? > 26. [PIC]: tristating i/o pins (3) > 27. [OT]: Battery Corrosion and How to Get Rid of it? (2) > 28. [OT]:Refilling HP smart cartridges (2) > 29. [PIC]: Simple Question on driving 7 segment display with PIC (2) > 30. [EE]: Any PLDs or PALs that don't guzzle current? (5) > 31. [PIC] Lowest power consumption > 32. [PIC]: First program, very odd results... > 33. [PIC]: Lookup Table Troubles > 34. [OT]: Leonid Meteors (2) > 35. [PIC]: Lookup Table Troubles -- More Details > 36. [OT]: Newfound electronics (4) > 37. [PIC]: Need help from an EPIC+ user (3) > 38. [EE]: How to amplify a phase difference ? > 39. [EE]: Does anyone have a circuit to power a PIC > 40. [EE]: Bulb Life > >-- >http://www.piclist.com hint: To leave the PICList >mailto:piclist-unsubscribe-request@mitvma.mit.edu > > >Date: Thu, 15 Nov 2001 21:02:05 -0800 >From: Lawrence Glaister >Subject: Re: [EE]: high-power generator/motor >MIME-Version: 1.0 >Content-Type: text/plain >Content-Transfer-Encoding: 7BIT > >Sounds like fun... it seems from my experience that you will have some >difficulty finding a generator for 20amps that is relatively small. I am >thinking that you may be able to use a small car alternator to generate >the DC you require. Since you have a PIC involved, perhaps you could >drive the alternator phases (A/C) and use the alternator like a 3 phase >motor for starting your gas engine.Once the engine is running, you can >switch the alternator into generation mode. The rpm ranges for the >motor and alternator are close, I would start with a 2-1 reduction >between the motor and the alternator. You will probably have to do some >bench work to see if the aternator has enough low end torque to start >the r/c engine. Keep us informed of your project... I would love a >similar unit to keep my ham shack battery charged during power outages. >cheers > >On Thu, 2001-11-15 at 14:18, Andy Meng wrote: >> Hello, >> >> I am making a generator for a large radio-controlled vehicle. The >purpose >> will be to keep the main 12V batteries (about 30Ah worth) charged. The >> engine I am using is a 4-cycle R/C aircraft engine, about 1HP (.61 >in^3 >> displacement). The engine will be coupled to the generator, which will >then >> be controlled by a PIC. >> >> The generator also needs to be able to start the engine by acting like >a >> motor. The engine speed will be controlled by the PIC by means of a >servo, >> with the PIC adjusting the speed for a certain voltage output from the >> generator. However, I don't know which type of motor/generator would >be best >> suited for this purpose. Since everything is DC, I assume it would be >easier >> to use a DC (permantent magnet) motor/gen. Efficiency isn't really >> important, since the project is mainly for fun. I think 20 amps from a >> generator (only about 250W, with about a 750W input) would be about >right, >> but it has to be about 14V output (to charge up the sealed lead-acid >battery >> bank), and turn with a good amount of torque (current is mostly >> insignificant on engine start-up) to start the engine (with 12-13V >input). >> If anyone has ideas on what type of motor/gen to use, I would really >> appreciate it. >> >> Thanks, >> >> Andy Meng >> N8MX >> www.qsl.net/n8mx >> > >=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >Lawrence Glaister VE7IT mailto:ve7it@shaw.ca >1462 Madrona Drive http://jfm.bc.ca/ >Nanoose Bay, B.C. http://members.home.com/cncstuff >Canada V9P 9C9 http://gspy.sourceforge.net >=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > Ever since I signed up for the list (digest mode) I have only been=20 getting 1 post each time - what's gives? --=20 dave@sinfin.demon.co.uk --=_Turnpike_AqXPFHAHxq97Q4e1= Content-Type: application/pgp-signature Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: PGPsdk version 1.7.1 iQA/AwUAO/asVhynHv/KM/MDEQKO5ACfUVUWaa+B+OdAthp/n48vgQ7hXQYAoKbd 2vVPnhaKo2kNTQ+cARK+JvL4 =c3Sr -----END PGP SIGNATURE----- --=_Turnpike_AqXPFHAHxq97Q4e1=-- -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu