thanks guys, I shall attempt to understand all of this BTW I am powering the whole setup (including the 555) from the one 12v supply
On Aug 23, 10:49 am, Don Shankin <[email protected]> wrote: > Good call, just be careful around those caps > > On Sat, Aug 22, 2009 at 6:13 PM, Gregory Pwneror <[email protected]>wrote: > > > > > > > If you need to find a MOSFET look inside an old computer power supply, they > > usually have half a dozen of them inside. They also have 1600uf capacitors > > :) > > > -Gregory > > > On Sun, Aug 23, 2009 at 7:36 AM, Frank Pittelli > > <[email protected]>wrote: > > >> Don Shankin wrote: > >> > Are you talking about MOSFETs? They're essentially voltage-controlled > >> > transistors (as opposed to being current controlled). > > >> Yes, there is a new breed of MOSFETs called "self-protected MOSFETs" > >> that are specifically designed to be driven from logic levels and that > >> protect against all kinds of problems. For example, see: > > >> http://www.onsemi.com/PowerSolutions/parametrics.do?id=819 > > >> The last time I looked (about 6 months ago), they only produced them in > >> tiny surface mount packages (which are too small for my eyes and > >> soldering skills :-) However, while googling to answer this question, I > >> see that they are now producing them in good old TO-220 packages, so > >> I'll have to see if my normal electronics suppliers stock them as well. > > >> The nice thing about this new breed is that (a) they are designed for > >> logic level inputs, (b) they protect the logic circuit from load > >> problems and (c) they don't need suppression diodes when used with > >> inductive loads. Basically, they are a one package solution for > >> switching 4-6A loads. When I start noodling with circuit designs in > >> the winter (the official season for circuit noodling) I plan on playing > >> with them to see how well they work for my purposes (cheap, durable, > >> easy to repair). > > >> Frank P. > > -- > ---------- > Donald Shankin > Computer Engineering Undergrad > Blue Marble Security Member > IEEE Vice Chair, MTU Chapter > NSBE Telecommunications Chair, MTU Chapter > CAEL Partner > (507) 301-2499 > [email protected] > [email protected] > ---------- --~--~---------~--~----~------------~-------~--~----~ You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat -~----------~----~----~----~------~----~------~--~---
