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Old 15th August 2012, 04:01 PM   #2281
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CD4049, CD4069, CD40109, 74HC14, 74HC04, the 74HC versions are only up to 5v though, wheres the 4000 series is up to 20V.
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Old 15th August 2012, 04:27 PM   #2282
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i have completed with my installation with IRS3000d but i got output when i connect it thru ocsilloscope and function generator....i dont get any reponse while using line in...suggestion required....any feedback would be highly appreciated...supply voltage is +/-25 volts with no alteration in components
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Old 15th August 2012, 04:35 PM   #2283
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Check your wiring! You likely have a missing ground connection that the ground lead on your scope probe completes.
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Old 15th August 2012, 04:42 PM   #2284
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Originally Posted by Tekko View Post
Check your wiring! You likely have a missing ground connection that the ground lead on your scope probe completes.
no its all right...i have checked that twice...the led on the high side lights up when there is some output..when i connect the function genrator it lights up...but otherwise no...
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Old 15th August 2012, 05:10 PM   #2285
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i placed CA3130 instead of TLO71 but no response now i replaced it with UA741 got some out put but have problem bcoz i have lot of distortion
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Old 15th August 2012, 05:29 PM   #2286
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Well DUH! The UA741 is about the worst opamp you could ever use for a switching circuit like this, its even a disgrace in linear circuits. The distortion is likely because the slow 741 is preventing the amp from oscillating fast enough, likely less than 100kHz.

Even the TL071 is a kinda bad choice, a wide bandwidth high frequency opamp like LF356 or better would be the way to go.
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Old 15th August 2012, 05:37 PM   #2287
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Originally Posted by Tekko View Post
Well DUH! The UA741 is about the worst opamp you could ever use for a switching circuit like this, its even a disgrace in linear circuits. The distortion is likely because the slow 741 is preventing the amp from oscillating fast enough, likely less than 100kHz.

Even the TL071 is a kinda bad choice, a wide bandwidth high frequency opamp like LF356 or better would be the way to go.

do u think ca3130 can do the job....instead of TLO71
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Old 15th August 2012, 05:47 PM   #2288
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Whats with all this will to substitute parts ? If all you have is slow old opamps that were designed for use in DC circuits like thermostats, then order some proper ones or even ones specified for high frequency off of digikey or such vendor.

Too many inexperienced diyers stare themselves blind at getting everything locally, and if they cant get thne parts locally, they dig up what them can get wich is just complete and utter trash, and wonder why the circuit doesent work.
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Old 15th August 2012, 05:52 PM   #2289
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Originally Posted by Tekko View Post
Whats with all this will to substitute parts ? If all you have is slow old opamps that were designed for use in DC circuits like thermostats, then order some proper ones or even ones specified for high frequency off of digikey or such vendor.

Too many inexperienced diyers stare themselves blind at getting everything locally, and if they cant get thne parts locally, they dig up what them can get wich is just complete and utter trash, and wonder why the circuit doesent work.
i dint get sine wave output replacing the UA741 will do the job....right???????/ i also got hiccups from the amp...thought it was sick and need some sirups of cough
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Old 15th August 2012, 06:36 PM   #2290
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getting high frequency distortion...what should i do???????
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