Recent content by pme720

I want to make sure I am properly understanding and applying Kirchoff's voltage law (the one where the voltages in the circuit add to 0V). Suppose I have a picaxe and an n-MOSFET as depicted in the picaxe manual 3 (pin to gate, V+ to load to drain, source to ground/0V). Now suppose my MOSFET's...

I am working with LEDs, and trying to get a better understanding of how current drive, LED voltage curves and voltage drop all come together. Assume a high powered XLAMP 4550 125mA green LED, data sheet here: http://www.cree.com/products/xlamp_docs.asp. So I can make this circuit...

I hooked up a 3.3V Microchip TC1108 LDO linear reg (300mA) with its 3 pins as follows: 1. Vin (4 NiMH batteries) to bat + 2. GND to picaxe 08M in/out 3. Vout to a parallel string of LEDs (twenty or so to handle the 300mA) By switching the PICAXE pin from input to output(on) (changes impedance...

I am using a peripheral that says "The Vcc Supply will also need filter capacitors per good engineering practice (typ. 50 to 100 uF)" As a novice, I have an idea WHAT this means, but not HOW to do it. So: 1. Are filter capacitors necessary if I am powering via batteries? I thought...

I want to use a Picaxe to control an IC via serial peripheral interfacing (SPI). Do any of the Picaxe chips support this? Another, unrelated question. How do I get an 08M or 18X SMT package in the US? The Canadian and US distributors don't offer the SMT form factor, and Rev-Ed wants an...

I know the answers are staring at me in the volumes of information on this website, but they are not written in such a way that I recognise them. As a double check, I ask: If I build my own project with no need of a reset switch or a download circuit (I download my program via axe090 then...

I found the answer to similar inquiries in the archives, so if I missed exactly what I need, simply point where to go, with my apologies. I want to output sound effects (mp3? .wav?) of some complexity based on certain input criteria. I have about 5 sound effects totalling 15-20s total. Size...