.:madworm:.'s photos with the keyword: MOSFET

The 'large' chip is 3mm x 3mm.

I needed these to run an old BLDC motor I scavenged from a dead hard disk.

It is a BSS138, a small (SOT23) n-channel logic-level MOSFET. It works ;-) If it didn't work you wouldn't see anything, as the MOSFET controls the LED used to illuminate itself.

These 2 MOSFETs in one chip package drive the two coils that make the toothbrush's head wiggle. It could play melodies as well ;-)

This letter contained 51 AO3400 MOSFET transistors. Shipping time was only 10 days, which is quite exceptional. Quicker than snail-mail from the USA.

Forgot to get the quartz, diode footprint doesn't quite match, still missing the programming adapter board... the usual stuff.

The thing is real. I just removed the headers by overlaying rendered gerber files.

Completed the first board of the 2nd revision. The 3rd revision has some minor changes, more suitable footprints and better locations for parts. This one works nicely too. Total power consumption is about 6mA - with the LED on (powered by the pull-up). So far the only power-relevant code shuts off the analog comparator. Maybe the ADC should go to sleep as well.

The ATtiny85 had to be forced to fit onto a standard (150mil wide) SO8 footprint. I don't feel like rerouting the board, so I choose to use 'the force'. You can take a look at an animated version on my blog. It's quite annoying ;-) It can adapted to work with any IR protocol, as it doesn't do any decoding. It only compares stored to measured patterns. There's a soft-UART in the code, so you can use it to print measured / unknown IR data and later add that to the known IR codes. Requirements: ISP programmer, suitable IDE to compile the code. It should also be possible to Arduino-ize the code and use the existing Tiny-core, but that is up to you ;-)

A dummy load. Peak current is 5A. That is currently (hahaha) limited by using only 5V as the reference voltage for the opamp. LTSpice simulations (with a different opamp) showed possible oscillations at a set-current of above 2A. I had to add another BW-limiting capacitor to the opamp that drives the MOSFETs. If I'm lucky the real thing won't need it. If it does I'll have to bodge it. I won't immediately order the V0.2 PCB for that. I only need one working board for personal usage. • BOM • schematic

A dummy load. Peak current is 5A. That is currently (hahaha) limited by using only 5V as the reference voltage for the opamp. LTSpice simulations (with a different opamp) showed possible oscillations at a set-current of above 2A. I had to add another BW-limiting capacitor to the opamp that drives the MOSFETs. If I'm lucky the real thing won't need it. If it does I'll have to bodge it. I won't immediately order the V0.2 PCB for that. I only need one working board for personal usage.

3 on purple.

Once the driver board has been removed, the LED ring will fit on the camera's objective. This little thing may be found on tindie.com

The LED ring fits on the camera's objective. Always sufficient light for macro shots. This little thing may be found on tindie.com