RE: Opensource CDI ignition
Hi all, I'm looking for useful spark plug cables for 1/4"32 spark plugs. The cables should be shielded and the isolator inside the metal housing should be silicon made. Any idea where to buy these cables? I found some in the US but these were not shielded and have no metal housing. Salut Uwe
Posted on: 6/8/2009 4:40 PM by Author "aerodactyl" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8836047

RE: Opensource CDI ignition
Hi guys, I want to continue with my project and wanted to test the version with the LT3750. I received the parts already several weeks ago but had not time to study everything. The LT3750 is so small (10 lead MSOP Pack), no way to make a layout and develop the board at home [&o][&o] Pin to pin distance is just 0.5 mm/0.0197". Has anybody an idea how to handle this? There are adapter boards available but board + shipment will cost about 12.- EURO. [:@][:@] The flyback transformer is no problem. Its big enough. Thanks for your comments. Best regards from Germany Uwe
Posted on: 4/24/2009 4:32 PM by Author "aerodactyl" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8712210

RE: Opensource CDI ignition
Hi Martin, last Friday I received the coils, but I'm still waiting for the LT units. The coils I ordered were the small and the medium version 3A and 6A (each 3 parts [:D] ) They really looks nice and small. Let's see how they will work. Yes, I'm aware of the layout. Next week I propably will find time to make a test layout for my system. I will keep you informed. Best regards from a snowy Germany Uwe
Posted on: 11/23/2008 1:31 PM by Author "aerodactyl" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8175386

RE: Opensource CDI ignition
Martin, I just studied the LT3750 device. It is similar to the one I already tested but nevertheless I ordered some samples too. Same for the coils from coilcraft. Let's see what will come out. The device I used was a MC34063. The min. time I found to reach 200V was about 6 ms with a several self-made transformers. I expect better results from the LT3750 because of the tuned coils for the LT device. Hope the parts will arrive within the next 2 weeks. Best regards from Germany Uwe
Posted on: 11/16/2008 4:20 AM by Author "aerodactyl" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8152213

RE: Opensource CDI ignition
Hi Rob, sorry for URL but you found the right part. I just rewind this core with 300 to ?? windings. I assume it was 22 from the test before. More than 300 windings were not possible because of the E ferrit. The result was better but not good enough. I work with just 1 primary winding. The clock is generated separately. This is much more easier to vary the frequency. The switch is a MosFET with very low resistance and should be OK. Looking on the oscilloscope the voltage raise up very rapid to about 100V, then the curve becomes very flat. [:(] [:(] That's still my challenge [:D] [:D] Later this week I will reduce the primary no. of windings and see what happens. Next step will be to remove the "walls" of the core in order to get more space and to wind the primary on top of the secondary winding. Best regards Uwe
Posted on: 11/11/2008 4:30 PM by Author "aerodactyl" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8137279

RE: Opensource CDI ignition
Hi Rob, thanks for the fast reply. I made tests with a coil where 2 E was "inserted". I bought [link]http://www1.conrad.de/scripts/wgate/zcop_b2c/~flNlc3Npb249UDkwV0dBVEU6Q19BR0FURTEyOjAwMDEuMDA3NC4xODEyZWVmYiZ+aHR0cF9jb250ZW50X2NoYXJzZXQ9aXNvLTg4NTktMSZ+U3RhdGU9MjMxODc4Mzk0Ng==?~template=PCAT_AREA_S_BROWSE&mfhelp=&p_selected_area=%24ROOT&p_selected_area_fh=&perform_special_action=&glb_user_js=Y&shop=B2C&vgl_artikel_in_index=&product_show_id=&p_page_to_display=DirektSearch&~cookies=1&zhmmh_lfo=&zhmmh_area_kz=&s_haupt_kategorie=&p_searchstring=516643&p_searchstring_artnr=516643&p_searchstring_manufac_artnr=&p_search_category=alle&fh_directcall=&r3_matn=&insert_kz=&gvlon=&area_s_url=&brand=&amount=&new_item_quantity=&area_url=&direkt_aufriss_area=&p_countdown=&p_80=&p_80_category=&p_80_article=&p_next_template_after_login=&mindestbestellwert=&login=&password=&bpemail=&bpid=&url=&show_wk=&use_search=3&p_back_template=&template=&kat_save=&updatestr=&vgl_artikel_in_vgl=&titel=&darsteller=&regisseur=&anbieter=&genre=&fsk=&jahr=&jahr2=&dvd_error=X&dvd_empty_error=X&dvd_year_error=&call_dvd=&kna_news=&p_status_scenario=&documentselector=&aktiv=&gewinnspiel=&p_load_area=$ROOT&p_artikelbilder_mode=&p_sortopt=&page=&p_catalog_max_results=20[/link]this. Is it similar to the core of FLPS? Uwe
Posted on: 11/11/2008 3:07 PM by Author "aerodactyl" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8136990

RE: Opensource CDI ignition
Hi to all people interested in CDI's. My name is Uwe and I'm from Germany. Please excuse my none perfect English. The reading of this thread was really interesting and you did already a good job, especially bigboat from NL. Years ago I tried to build a CDI by myself, but just with medium success. The base I use is slightly different to the version your are talking here. I work with an external oscillator for the DC intermediate circuit. The rest looks very similar. Basically my system works but I have problems to raise the voltage fast enough for high speed engines. The best result I ever reached was 6 ms for 150V in a 0.47 µF capacitor after the fire signal. My target is to reach less than 3 ms as it was reached with the poor system described in an article od Floyd E. Carter. Unfortunately I couldn't find the link any more. The way how to create the DC voltage is the same as the version of bigboat. I already read the full thread but I couldn't find any no. of ms or a scope diagram. But if the CDI will go up to 30000 RPM the time have to be less than 3 ms. The problem I encounter is the "transformer". I tried different version but with no success. I found out using a ferrite ring is more insensitive to frequency variations of the oscillator than other versions. Before ordering the FLPS board just to have the e-core is somebody of you able to tell me your reached values of: - max. DC voltage - raise time up to 150V - used capacitor (µ47F?) Would be nice if you could support me with some technical details. Thanks in advance. Uwe
Posted on: 11/11/2008 2:22 PM by Author "aerodactyl" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8136852