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FvM, yes this could well be the reason why, if i hold the Gate of the SCR at 0V there is no problem, if i bring it up to 5V (with 500ohm resistor) quickly and then back to 0V i can generate a spark, but then i have to be very quick to turn the power off to the system or the resistor (OPTION 1)...
Hi Klaus, yes according to the datasheet ref spec and with reference to the webpage where the step-up converter was used for the Nixie tubes the 100nF was incorporated, i did not put in another polarised HV capacitor on the HV side as i thought that C4/C5 would be the capacitors on this side of...
Hi Guys,
Im having a bit of trouble with a circuit. Please see schematic below. the top portion is a Capacitor Discharge Ignition circuit using a SCR, this is triggered by a microcontroller (not in schematic), the second portion is a 150-250V DC generator using a Step-Up DC-DC Controller (using...
Yes quite right, the later model of these CDI units did use a HV generator in the unit itself and no generator magnet/coil setup. i have pulled this one apart and it is the earlier type.
Great! thanks for the explanation Brian. :-)
Klaus, how about 87K resistor and a 3K resistor, this...
Ok Brian, i understand, forget i ever used the word "fast" .. i was simply meaning without delay. as i said before i should have been more precise.
Klaus, using the 1.5M and 30K ohm resistors would give 2.94V.. im looking for around 5V
w.r.t to the CDI info, the capacitor is charged via a...
apologies guys, was out of town for a few days following your replies.
i need a digital signal out the other side. Brian,. yes i get it, it does not need to be 40000rpm fast.. just 7400 S fast or around the 5uS mark.. at least HCmos fast, i should have elaborated on what i meant by fast :-)...
Hi Guys,
ive been scratching my head about this, have looked over the web but i cant seem to figure out what device to use. the problem:
i have a 150V signal coming from a Capacitor discharge ignition system that goes into a coil to produce high voltage that goes toward the spark plug (i.e...
Hi All
would anyone be able to help me out, or point me in the right direction of some documentation for this, i have searched the web and read through xilinx documents but cant seem to find an answer:
i have a project for targer XC9500 series CPLD, has top level shematic and a pin.ucf file...
see this is the part that is confusing me. if the above statement is correct i have 8V at 5A going through a 0.1 ohm resistor. using P=V*I this give me 40W. but the question is.. we have 40W of power being used by "the load" doesnt that mean that the resistor should have a power rating of 40W to...
Thanks for the reply Brian,
ok so im working with a circuit with 4xLM338 with resistors values of 0.1 ohm each. this would give me a power dissipation of 2.5W when 5A is being drawn from each regulator (so i can get the full 20A - LM338 is rated for 5A) so if i choose a 0.1 ohm cement resistor...
Hi Borber,
thankyou for the reply! yes you are correct im fairly new to op-amps and high current power circuits using silicon and not just straight big transformers and capacitors, this is infact my first post in the Analog section on this forum. Digital electronics is where my knowledge lies...
Hi!! thanks for the reply, i have been looking over the datasheet and i see another circuit that looks a bit better with the use of LM741. i would still like to use it for 8V 20A supply. will the LM741 work with 8V supply?
also i dont understand the calculation. am i going to have to use a 50W...
Hi All,
i have the below circuit, straight out of he Texas LM338 datasheet as a reference circuit, i would like to use it to build a 15-20A 8v power supply, what i dont understand from the circuit is the resistors R5 and R6 being 0.1 Ohm each. i understand that for 15A the circuit uses all 3...
HI Guys,
im just in the middle of designing a power supply for a board with Xilinx Spartan 3E and a couple CPLD's on it.. i have read a mountain of datasheets from Xilinx (ds312, ug313, ug786, xapp623 etc) and looked over a few schematics of boards with similar hardware.. allot use custom...
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