ljcox
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Does your parts supplier sell a cheap audio amp IC?The speaker output seems okay, but if I want to boost it, would I use a transistor? I have three to choose from: 2N2222, 2N3904 and 2N4401. Is there a difference?
It depends on how much output power you want and the tone quality. You could make a simple amp with 2 transistors, but the quality may not be adequate. See below.
And, if I want the second note to fade out instead of stopping abruptly, is that difficult to add in?
It should not be too dificult. I'll put some thought into it.
There is no particular advantage in choosing one or the other in this case. Either will do. Decide upon price & availability. If they don't have either, ask about the CD4066 & 74HC4066. These are les convenient, but I can design around it.My apologies, I prefer the first option, with the volume fading after the 1 second tone. It can be a fairly quick fade, too. Just something to smooth out the end of it.
You will be able to select the timing yourself by changing C * and/or R.
My wall wart outputs 12v, so I can use that for the amplifier. yes, that will be adequate.
Which would be preferable, the TDA 1905 or LM380? And, between the 74HC4052 and CD4052?
He answered this in a previous post. He wants to learn about logic gates, etc.i dont see whats wrong with using a pic508 3 caps and three resistors
pwm driven tone and the res and cap used on its i/os to get sine wave...
it has 6 i/os so you can add a pair for some sort of controls as 2 bit bin select or 3bit pin select
you can program a 508 or any pic with ic prog and just rs232 port alone
so... and free compilers are there for this task
any comercial one will allow for small code or free use for this small vcheep ic
i think less than 7 lines of code is needed
amplify it using a standard LM386.. for 1.5watt or a single 2n2955
or some other audio ic prefered is
one that needs no external components
sorry i just dont see the point these days in 555 and bloated cmos and ttl / passive
8)
I have no PNP transistors, but I can easily pick some up as well.I think you may have missed the edit to my last post as you have not mentioned the transistor question.
If I was starting this from the beginning, I would probably use a PIC as well, from what I've briefly read about them. I'm not sure where I would even start with something like that.If I was doing it for myself, I would also use a PIC.
then read a BOOK!
if you need to add logic ic's to a mcu design
you are a weak programmer
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