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Re: An audio question
As flatulent stated, if you try to send signals to speakers that are beyond their ability to pass on, they dissipate it as "heat" as I recall correctly, ie not as sound, and that can destroy your speakers.
Which will certainly make someone uncomfortable.
Also, as pointed...
You need an inverting buck-boost, which is an "easy" switched-mode power supply circuit, in its simplest form.
It'd require a pmos, gate drive, diode, inductor, and cap.
I don't know how to link things, I apologize, but if you search for those terms you'll no doubt find a schematic. ^-^
Re: dc dc converter
As folks mentioned some more info would help, so that we have all of the following
Vin
Vout
Filter Inductor?
Filter Cap?
Load?
Off the top of my head, do you have a resistor in series with the base? ( Assuming you're using a bipolar )
Is the device rated for the currents...
I don't like all that negative notation, so I learned from a professor to do everything in terms of positive quantities.
Let's say you went to a magical foundry where they tell you
... on my sheet of paper, I'd take the magnitudes and write
so then when figuring out currents, neglecting output...
Go PMOS!
Find a comparable PMOS, definitely.
I made that self-same mistake once.
To reverse the control signal, just connect your ramp to where your control voltage was, vice versa.
If you don't do this, what'll happen is that it'll look like (1-D) – ie D' – is controlling the output...
It's possible that you're not driving your MOS hard enough, you want it to be very very on, on hard, ohmic ... could that be it.
Are you able to generate low voltages, ie < 5v fairly easily?
Added after 4 minutes:
OOps, I forgot to add this ... is the current mos you're using an NMOS ...
I meant to add
I meant to add, essentially you have 2 "transconductance" opamps, OTA, set up in parallel, an NMOS input and a PMOS input type, with wide swing outputs.
A picture ( difficult to understand in my opinion ) can be found on page 287 of the Johns and Martin book"Analog Integrated...
One way is to essentially have 2 op-amps in Parallel
I recall doing this in grad school. I don't have my textbook with me.
Doing a Yahoo search on "rail to rail" pnp npn input output yielded this PDF which is a more clever version of what we did: entitled "Low-Distortion High-Speed...
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