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  1. M

    PCB Spark Gap - HOW TO

    Hi, Anyone know how to create/design for the PCB spark gap? I found limited information on how to create the spark gap on PCB. Any requirement needed to follow? For your information, spark gap can provide significant protection against voltage transient. Regards
  2. M

    Transistor Protection

    Let say if i have a transistor switching circuit as in the diagram (attached image), by switch on the J1, the voltage drop across Q3 will cause damage to the transistor. Is there any way to add a control circuit to turn off the Q2 so that Q3 will off as well. Thank for the opinion as i start...
  3. M

    Single Supply Op-Amp with Negative Ouput

    Is that possible to design single supply op amp (O-5V) rail-to-rail, to provide a negative ouput voltage?
  4. M

    6V 5A PSU problem.

    I have a question here...i currently doing a power supply which is capable to supply max of 6V and 5A of output. the PSU is a digital PSU with microcontroller and LCD interface which means that the output can be adjusted to any desired value. the problem is the output ripple noise of the PSU is...
  5. M

    Protel PCB layout

    hi guys..i need some help on this protel software.. i got the schematic and go through all the procedures until i get the PCB layout. but i dunno how to print out this layout so that i can transfer the circuit to PCB. if i select print option..it will print out the layout fixed to whole A4...
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