Aaay Miguel …¿.Kay Towel ?<p>Well, I thought that I would plot out a schema for your described low voltage repeat...LOW VOLTAGE operating CMOS ckt...in keeping with the main capability of the original LM3909 IC circuit...by using your info supplied.
Logically, the 12 VDC supply went to a 1k curr lim resistor and on to a green LED with that juncture feeding to pin 14 of the 7404 for Vcc ....with its pin 7 to gnd...thereby getting the power interfacing to the IC.
Then I was successful in sequentially making the component interconnects within the suggested block layout.
Parts were falling into place, up to the point where pin 2 had its "34µF Tn'' cap hanging off to be terminated... (along with the earlier open end of ''33µF Tn '' floating off from pin 4 in a likewise manner)
After that, the described further interconnection sequencing order to the LED and the "11k" resistors became somewhat vague and questionable.
At that point I switched to recreating the drawing utilizing logic inverter symbols in a schematic layout, instead of the previous block layout, then possibly expecting to see a switched capacitor voltage pump up circuit be materializing from the interconnects, along with a low freq osc/pulse gen to slow pump the LED, but it never showed itself using the way I had interpreted the described interconnects.
I initially thought that the novel "designation'' of the variants of the 3 sets of duplicate parts might work out OK, but after trying to interconnect to the two "floating 'lytics and the two 10k resistors and the LED , they seemed to be only creating some degree of questionability .<p>Soooooo...might I possibly suggest that you recreate the "verbal semantics" schematic with clarification by using:<p>33ufd(A) 'lytic along with its designated + or - lead
33ufd(B) 'lytic along with its designated + or - lead
0.33ufd(A)'lytic along with its designated + or - lead
0.33ufd(A)'lytic along with its designated + or - lead
[Exclude the above 2 caps if not electrolytics, as otherwise they were unambiguous in their installation, as was the 2.2 meg resistor]
10K(1) res with its leads A & B
10K(2) res with its leads A & B
LED with its designated anode and cathode leads<p>BTW.....what function did the LED unit serve in your automobubble....eye candy.........a car alarm "armed" indicator (either in reality or a "fake" one) and was the green LED ''ersatz zener'' one visable adjunct to it also ?<p>ADDENDA
A last minute forgotten aside for Sir Christopher:
At about the same time frame as your parasitic LED flasher circuit, did you also happen to catch the modicum of simplicity /vs /functionality as being all encompassed within the circuit of:
http://www.elecdesign.com/Files/29/1823/Figure_01.gif <p>
73's de Edd
[email protected] .........(Interstellar~~~~Warp~~~Speed)
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<p>
On the side window of my new car there is a sticker that reads" This vehicle is protected by a passive security system". I didn't know what that meant until I touched the door and heard, " Aw c'mon......... go away................ Pleeeeease."<p>[ September 06, 2005: Message edited by: Edd Whatley ]</p>
<p>[ September 05, 2005: Message edited by: Externet ]</p>
