stuck on transistors again
i am attempting to build something like this http://hades.mech.northwestern.edu/i...l_follower.gif
for a simple push-pull amplifier..
but I only have one type of transistor.
Is it still possible?
By the way I found this type of transistor but I wanted to see how I could get it working the simplest way possible.
It's from a TV (and whoa my computer monitor just randomly got all stripey pink all over then fixed itself but that's off topic)
No - you need NPN and PNP
The device you pulled is not a transistor, it is an IC, a small audio power amplifier.
okay so how do I hook it up properly?
I have the components for it
nevermind I got the IC working but no matter what I try.. I can't bias it properly at all D:
i tried using some various resistors but it makes no difference wherever i put them D:
maybe i still didn't put them in the right place
but the gain is still HUGE!
with a 5 volt DC power adapter the gain is so huge. it's working... but I need to bias the darn thing somehow...
i tried all combinations of resistors here and there...
it actually has the most sound without any resistors sadly..\
i'm stumped on why it's not working..
For the IC to work you need AC coupling caps Cin and Cout as shown on page 3.
To reduce gain you need to add a resistor in series from pin 2 to ground. Try 1k ohm.
Try to run on higher Vcc, 12volt to 20 volt.
yes i got those put on it.... but they do not make much of a difference.. output still sounds blocky and square waved...
Ok, then try to ad 50k ohm from Vcc to pin 1 and 50k ohm from pin1 to ground.
This will set DC point Vout to approx: gain x Vcc/2. To reduce DC gain to 1x put a cap(20-100uF) in series with resistor that you add in series with pin2
ok now it sounds way better but there's a heck of a lot of buzzing!!! sounds like a buzz horn going off i can hear buzzing over 5 feet away!
How do I get rid of the crazy buzzing?
and the gain is still extremely high..
My PC's volume is set to 0% and I can hear it clearly coming from the speaker..
oh since I can't edit my own post
I wanted to ask..
How exactly do I seriously lower the gain of this amplifier chip?
I tried putting 12 volts for it for a split second but it made my speaker just go in a frenzy of static and jumping over my table because the gain is absurdly high
so with only 5 volts it's perfectly stable. but still has a huge amount of useless static in the background..
and my computers volume has to be at like under 5% for it to sound clear
it sounds perfect at 4% but I don't like the static that I continuously hear in the background
Are you 14 years old? Serious.
No. I just turned 15.
And now I can hear a totally random radio station now when I put a resistor in series with the input wire. and it's clearly audible
anyone listen to the radio and hear band aid brand advertisements and some kind of weird music?
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