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Recent content by ash1412

  1. A

    looking for MIC circuit

    I am not able to understand "Jfet to ramp down and up the volume during muting". can you pls share it?
  2. A

    looking for MIC circuit

    Hi AudioGuru, I would like to add mute switch with LED (momentary) in MIC circuit as attached by you in this thread. pls suggest. Is it possible to drive power to IC used in attached circuit from O/p of given below circuit(OP1 or OP2)? **broken link removed** Thanks in Advance Ashwani
  3. A

    pulse turns on an LED circuit and another turns it off

    Hi All, I am looking for simple circuit based on transistor for a push switch(momentary) that when I push it once it closes a switch and keeps it closed until I pulse it again. One pulse turns on an LED circuit and another turns it off. Thanks in Advance
  4. A

    stepper motor driver for 3.3 & 1.8v processor IO

    Thanks for your reply. stepper motor ratings: 5.0V, 10R phase resistance. I was confusing with lines in uln2003a data sheet "The ULN2003A and ULQ2003A have a 2.7-kΩ series base resistor for each Darlington pair for operation directly with TTL or 5-V CMOS devices." can be use uln2003a directly...
  5. A

    stepper motor driver for 3.3 & 1.8v processor IO

    Hi All, I want to interface unipolar stepper motor with my processor having 3.3V & 1.8 V IO. Anyone suggest stepper motor driver IC for the same IO voltage level, replacement of ULN2003a(5V TTL/CMOS). Thanks in Advance Ashwani
  6. A

    looking for MIC circuit

    Thanks, can you please suggest tantalum caps assuming using same 9V battery?
  7. A

    looking for MIC circuit

    Hi Audioguru, Can I use Tantalum/SMD caps in place of Electrolytic(47uF, 100uF, 22uF) caps. If yes, what would be the suggest values. Regards, Ashwani
  8. A

    Suggest me a LED flashing circuit

    press 1st time led is blink press again it goes continuous ON, press once again blink and its on Again.
  9. A

    Help me design a 250mA upto 5V stepper motor driver circuit

    Re: Stepper motor driver Sorry for first post. I am looking 3.3 Volt stepper motor driver circuit because my processor support only 1.8V/3.3V I/O signals. What is the difference between unipolar and bipolar stepper motor? My stepper motor has four input wires only. can I use ULN2803 or...
  10. A

    Help me design a 250mA upto 5V stepper motor driver circuit

    Hi All, i want to design a 250mA upto 5V stepper motor driver circuit can any one help me please? thanx Ashwani
  11. A

    Suggest me a LED flashing circuit

    Re: LED flashing circuit yes, I am not using any Micro-controller in my board. This type of circuit basically i want to use in my mic preamp ckt. When MIC is mute LED blink and MIC is in use LED continuous glow. Any opamp based LED toggle ckt is appreciated.
  12. A

    Suggest me a LED flashing circuit

    Re: LED flashing circuit no third push again LED blink. I do not want to use any IC. Any transistor or opamp based ckt?
  13. A

    Suggest me a LED flashing circuit

    Hi All, I am looking LED flashing circuit, in first time switch press LED blink and second time switch press LED glow continuous. Regards ashwani
  14. A

    what is the difference among the differential head set mic, mono mic and stereo mic..

    thanks KAK and elex. Regards Ashwani
  15. A

    what is the difference among the differential head set mic, mono mic and stereo mic..

    Thanks KAK, Any connection difference with respect to normal mic e.g. mono/stereo.
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