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I have just tried the push-pull configurations suggested a few posts behind. It seems they work fine, even though the BJTs heat up a lot, I will need to use good heatsink.
I had no luck testing the circuit posted by BradTheRad though, but I guess it has something to do with the 555 clock, I'll...
I appreciate the advice, FvM.
I have tried that path already but I am unable to design such circuit, they are too much out of range for my limited knowledge. You may remember I have asked about buck-boost converters a few months ago, you've been one of the users who helped me with that. You may...
I need to use an external power supply, like a laptop power supply, to power up the entire project test bench project. I will need a digital power supply (both 3.3V and 5V) which I have already figured out how to achieve, and then I need a split power supply that should be achieved from a single...
I was suggested of using two switching voltage regulator circuits (maybe based on the LM2596-ADJ like *this one*, or other ICs) on the splitted voltage lines. It would allow to regulate the output voltage on each line so I could achieve a different dual supply voltage (e.g. 9-0-9 or even 8-0-12...
Thank you guys. As soon as possible I will get some components and test the solutions you have suggested. I'll let you know if something is not working :)
Let's make it clear: although this virtual ground power supply is going to be used for audio amplifier prototyping too, it is intended for a much more general use. As I said, it would be the power supply to use on breadboard prototyping, so I could even use it to power other ICs, including...
The circuit is to be used for a small portable bench test, with a prototyping breadboard on it. I actually don't care if the output is low or high impedance (I don't even know the difference to be honest) as long as I can use as many components as I want without worrying about reaching the...
I need to design a split power supply starting from a single power supply. The single power supply is supposed to be 24V (at least 2A) so as to have a perfect 12-0-12 split supply, but I'd like to be able to use even one as low as 19V (still 2A minimum).
The required output power of the split...
Thank you for your feedback guys!
The reason I have avoided using ICs is that they usually can't provide more than 30mA current on each pin. I might need instead up to 5V 100mA outputs. Do you know any ICs that can handle that?
Refer to the original schematic in my first post. SW1 is on the middle left. SW1 is the (toggle) button that I use to select between pull-up and pull-down. When SW1 is high it creates the pull-up circuit that you see on the left side in my previous post. When it's low it creates the pull-down...
Not if I want to switch between a pull-up or pull-down output.
The pull-up/down circuit on the output must act either as default high or default low. Then, when you press the button "SW2" it should:
if default high => act as pull-down, switch the output to GND.
if default low => act as pull-up...
As I said before, the transistor acts as a NOT gate. It's use is to swap the output based on the input, so I can use a resistor-switch circuit as either pull-up or pull-down. The difference between the latest in fact is they have inverted V+ and GND. The transistor helps doing that.
You might be...
need advice on pull-up pull-down switch circuit
I need to design a circuit for a push button which, when pressed, should behave either as a pull-up or pull-down. So I though of a simple NPN -based circuit that simply swaps the V+ and GND lines across a pull-down circuit.
What happens is this...
Thank you for the link, contains a lot of information on thermistors. However, it still doesn't solve my issue. I would like to use the flat-head thermistors like the ones in the images above, but I seem unable to find them to buy for cheap; I could only find them for 10$+ each which is totally...
I need to use a few thermistors for some temperature readings. The places where I need the temperature readings are very tight so the first thing I could think of is those flat-head thermistors that manufacturers usually include with fan speed controllers, or other digital thermometers. Like...
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