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| Alternative Energy Discussion relating to the design and implementation of alternate energies. |
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29th April 2008, 10:40 AM
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| New Member  |  arrgghhh!!! the legs work separately but when i put the whole thing it doesnt work....i think that the timer cannot drive all four... |
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29th April 2008, 10:49 AM
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| Experienced Member    | Quote:
now worry. please take care of base current needs by managing the series base resistor. 555 has adequate capacity.
__________________ Regards, Sarma. Last edited by mvs sarma; 30th April 2008 at 02:52 AM. | |
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29th April 2008, 11:58 AM
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| Experienced Member  | Quote:
The circuit you have built, NOT simulated, does it have the 10K resistor as the load or the motor and is it the last circuit you posted.? If its a motor, whats it voltage and current rating.? The 20K/10K base resistor look too higher a value. The 555 should be able to drive that bridge with no problem.
__________________ Eric "Good enough is Perfect" PIC tutorials: Nigel's: www.winpicprog.co.uk/ Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/ | |
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29th April 2008, 06:57 PM
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| Experienced Member  | At extremely low currents, emitter and collector of many BJTs are almost interchangeable. This is one of the traps of simulation. Lesson: Simulate with your intended load! |
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1st May 2008, 05:32 AM
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| New Member | well its done....a 555 timer with an inverting buffer driving four NPN H-Bridge...it didnt work the first time coz of the base resistances...and also becoz the inverting buffer had popped (the second time)...so my 12VDC power supply showed a short circuit it works.... finally thankyou very much everybody |
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