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  1. C

    unexpexted performance of unipolar stepper driver.........

    I am using the attached circuit. By providing 0 to Enable point, it starts moving the motor in both directions, some steps to one and some to other direction without any more input and stops by providing 1 to enable. I want to move one by one step. Please guide.
  2. C

    Making switching NPN with PNP

    There is a small circuit schematic attached where I am using voltage regulator 7812. I input 24VDC and 12VDC comes out from OUT pin. I want to make switch off & on NPN transistor with 12VDC buy using PNP transistor before NPN. And I will use PC printer port to provide the 1 & 0 pulse of...
  3. C

    TIP142 Stepper motor driver

    I am going to build following circuit to run stepper motor using TIP142. So is there any need to change any thing in this circuit? The schematic of circuit is attached with this post.
  4. C

    Increasing the DC 5V 250 mA adopter volt & amp.

    I want transformerless power supply with 24V 2 Amp and I think any existing cell phone battery adopter can do it for me. I have an DC adopter (5V 250 mA) and want some changes in the circuit to get my desired volt & amp. You can review the circuit of any of your adopter, as most peoples has...
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