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  1. S

    741 Offset voltage problem

    Hello guys, I'm using the UA741 op-amp but theres a problem.. offset voltage ! I always get (saturated +ve output) until the inverting input (V-) is 1.8 volts greater than V+. Now 1.8V... isn't that ALOT ? Anyway, I tried using the offset null pins but they didn't work ! Here's what I did...
  2. S

    TDA1554 22W Amp

    Okay one final question. You said I should connect the stereo via an attenuator. Well the mixer circuit has the inputs connected to a pot & a resistor, isn't this enough ? Thanks & sorry for all the trouble :)
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    TDA1554 22W Amp

    My car stereo doesn't have any inputs. It only has an amplified output. I want to connect my mobile phone to the car speakers to emulate a (mobile car kit). Here is what I'm thinking right now: stereo (amplified) ----->Mixer ----> Speakers Mobile -------> Amp --->| Would this...
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    TDA1554 22W Amp

    Hi all, I need to connect this amplifier to my car speakers, which are also connected to a car stereo. That would lead to 2 amplifiers connected in parallel, giving different output signals. Do I risk damaging this amp and/or the stereo's internal amp ?? I mean will something really get burned ...
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    Power Supply problem

    Thanks audioguru for your great explanation :) It'll take me a few days to try it (exams), but I'll keep you informed.
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    Power Supply problem

    Audioguru: So what you're saying is the transistor is already damaged ?? Is this a common transistor fault ? btw, the 10A came from 2 transistors in parallel - I added a similar one with the base resistor and all. audioguru: So theoretically, should this circuit run fine under all loading...
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    Power Supply problem

    Hey guys, I'm trying to build a power supply for a car-based MP3 player (a stripped down computer). I've tried this link for the +5v rail, it gives very good current (upto 10A now) but there's one CRITICAL problem: when not loaded, the output voltage is 12V !! Just to make it clear, I'm using...
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