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Recent content by sameerdhiman

  1. S

    How can i connect two FL tubes(18W ) to a 40W ballast

    Yes on 220V mains supply. - - - Updated - - - Yes on 220V mains supply.
  2. S

    How can i connect two FL tubes(18W ) to a 40W ballast

    Thanks iukhan but I have already mentioned that magnetic ballast and starter arrangement has failed for me due to non availability of 110V starter. If you know something about series connection using 36W electronic ballast please share.
  3. S

    How can i connect two FL tubes(18W ) to a 40W ballast

    I have question how middle filaments will preheat and form ARC when they are electrically isolated?
  4. S

    How can i connect two FL tubes(18W ) to a 40W ballast

    Will you please elaborate the series connection of 18W FL on single 36W Electronic Ballast
  5. S

    How can i connect two FL tubes(18W ) to a 40W ballast

    Hi, I am also searching for the same. I connected two 18W FL in series with 36W Magnetic Ballast but not able to find suitable 110V or PHILIPS S2 starter in local market in India and failed to lit both FL. Masters your suggestions/tips are highly required So far, I've found that electronic...
  6. S

    [SOLVED] Mathematical Formula for given circuit ?

    Thanks :smile:
  7. S

    [SOLVED] Mathematical Formula for given circuit ?

    Thank you so much FvM :smile: Vninv = V1×[R2/(R2+R1)]×[1+{R4/(R5||R3}] ---------- Post added at 16:16 ---------- Previous post was at 15:51 ---------- May I know why we put R3 parallel to R5 ?
  8. S

    [SOLVED] Mathematical Formula for given circuit ?

    Hi FvM, I simulated the circuit under LTSpice with the following values. Ideal OpAmp: .subckt ideal-opamp 1 2 3 G1 0 3 1 2 100Meg .ends ideal-opamp R1=10K, R2=270, R3=1K5, R4=560 and R5=27.5, V1=1Vpk-1KHz, Vout=0.198133 Calculation Used: Non-Inverting Vninv = V1×[R2/(R2+R1)]×[1+(R4/R5)], So...
  9. S

    [SOLVED] Mathematical Formula for given circuit ?

    Hi, Can somebody give me the mathematical formula for the following circuit. Where R1≠R2≠R3≠R4, R5 is variable. Calculate Vout for any V1 value.
  10. S

    State Variable Notch Filter Depth

    Thank to everybody. In Sallen-Key's Twin-T topology I used NE5534 and manually matched capacitors/resistors within 1% and utilized multi-turn pots for tunning. I am able to get -64 dB rejection. NE5534 is configured as voltage follower to give pass band unity gain. After receiving parts I'll...
  11. S

    State Variable Notch Filter Depth

    Active Filter Cookbook : Do you have soft copy ? Well, currently I am able to achieve -45 dB deep notch without matched components (Resistors=5% Carbon and Caps=20% Polyester). The intended purpose of this filter is to extend sound card based spectrum analyzer's range.
  12. S

    State Variable Notch Filter Depth

    Hi, Can we practically achieve -60dB or more deep notch with state variable filter topology ? Is the state variable notch depth also depends up on close matching of components like in Twin-T ?
  13. S

    Bubba Oscillator and THD

    Hi, Today, I made some modifications in feedback loop and measured the THD again. Obviously THD+N figures are high for TL074CN. On coming Sunday (10-Apr-2011) I'll give NE5534 a try again. TL074CN (Wien Bridge) ================= Vout = 556mV (RMS) FQ = 998.7 Hz THD = 0.00065% - 0.00103%
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    Bubba Oscillator and THD

    Hi FvM/AudioGuru, I tried but could not found OPA227/228 in our market. Yesterday, I built the circuit again using NE5534 (Philips) and Metal Film Resistors. The results were worse compared to previous TL074 results but this time there was no sign of hum. I tried with and without compensation...
  15. S

    Bubba Oscillator and THD

    Hi, I have Yamaha DS-XG PCI sound card also. Today, I ran input (Line-In) connected to ground test on both sound cards using WaveSpectra v1.40E. Reports are attached. Please suggest me which sound card should I use for THD measurement ? Can we determine from reports the lowest measurable...
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