# Recent content by PomPom

4. ### Pros/Cons of Multisim Blue vs KiCAD vs DesignSpark

Hi folks, I'm sure this question comes up a lot but it's hard to find a good comparison. I'm looking for a new free schematic/routing software. Having a large library parts database is nice, but I prefer to make my own parts, so really I'm more interested in what is easiest to make parts...
5. ### is the turns ratio of a transformer an indication of inductance ratios?

Hi i'm looking at this transformer, P3855.006 (21uH) https://productfinder.pulseeng.com/products/datasheets/P719.pdf it says primary inductance is 21uH. But turns ratio, for one set of the xfrms, is 1.33:1. So is that side also 21uH or does it scale to 16uH? Im designing a boost converter...
6. ### dsPIC33 : If i enable a ADC peripheral, does each GPIO on the port become ADC-only?

thank you all!
7. ### dsPIC33 : If i enable a ADC peripheral, does each GPIO on the port become ADC-only?

https://ww1.microchip.com/downloads/en/DeviceDoc/70000657H.pdf Datasheet for reference ^ i'm looking at this PIC because i like the large number of IO, as well as ADC/SPI available. i'd like to have an ADC channel. there are up to 8 channels you can mux in to the ADC. my situation is: i only...
8. ### what's a simple way to get a mean/average value of an audio signal?

thank you all for your advice. i'm trying the higher order filters when i get back around to it. as i simulate, i see ripple during a steady RMS signal (EG a 1kHz sine wave). i'm trying to avoid that. i'll report back shortly. thanks again
9. ### what's a simple way to get a mean/average value of an audio signal?

I'll probably end up using an ADC on a microcontroller, but i'd like to do this in an analog fashion. i want to take an audio signal, say 200-10k Hz, and see what it's average value is. i've seen the rectifier circuits with the RC on it, but it gives too much ripple on the output. accuracy...
10. ### What kind of electrical motor can resist motion when stopped?

I'm not very well versed in motors. I'm looking for a motor (DC or AC, i really don't know the difference, probably DC, seems easier to design a control system). It needs to be able to move in both directions, but also have an ability to "stop" and resist motion. But also, I'd like to to be...
11. ### simple 555 polarity inverter voltage droops from very low

Thank you for your help. I thought I was well within the 555s current limit and that somehow switching speed/cap values/diodes were the issue. I ended up just sitting another 555 on top of it (for 2x the power output) and it regulates to 6.5 now and i'm pleased with that. However, I am curious...
12. ### simple 555 polarity inverter voltage droops from very low

This is the circuit: https://www.aaroncake.net/circuits/vinvertr.asp With no load it does fine. But by the time it gets to 50mA it's down to -3V. Ideally I'd only exchange components here. I used all the parts shown except I used schottky diodes ( IN5819 ). I had a IN4007 in there before...
13. ### How do you arbitrarily move the dc bias of a signal to a bias point

So if I were to model this, it would be a capacitor followed by an ideal DC source at 2.5V? or a resistor divider where on the other side of the capacitor the voltage is 2.5V DC?
14. ### How do you arbitrarily move the dc bias of a signal to a bias point

I have a signal that can be anywhere from .5 - 2 V pk-pk but at varying levels of DC offset (anywhere from 1 - 2 V). I want to just set the DC mean value of these signals to, say, 2.5V across the board. Is this possible? Thank you.
15. ### Guitar Effect Pedals: Question about powered/biased input jacks and modulation

OH! that is incredibly helpful thank you very much. So for single supply opamps in effects circuits, the opamp must be biased up to, say, 4.5. And for modulation I'd have both signals biased to the same voltage?