I just tried seperating the PSU's, powering the logic and SSR off a 6v and the solenoid totally seperate off 12v, same issue, switches on and stays on.
basically the whole thing was connected to a 6v battery, one lead of the solenoid went to + of a 12v battery, the other solenoid wire went to a load pin on the SSR, the other load pin went to - on the 12v battery. when it stays on, the relay is NOT powered at the input, yet it still makes a load circuit, WTF ? how can this happen? driving an LED off the same terminals as the SSR input and the LED blinks as expected for the time delay and then switches off, so the 555 seems to be doing its thing; press button, LED comes on, solenoid switches on, time delay expires LED goes off, solenoid stays on, SSR load circuit stays complete I'm confused On Aug 23, 11:51 am, Mike Mane <[email protected]> wrote: > I might as well ask an electrical question myself. What is the > cheapest (or at least simplest) way to reduce the main tank's voltage > X volts to power small, intricate IC's, etc on a circuit that require > <X volts? Is there any way to reduce voltage like this without harming > the circuit or messing up the battery? Is resistance the answer? > > —Mike "not the electrician" Måne > > Message sent by way of mobile device > > On Aug 22, 2009, at 7:49 PM, 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 -~----------~----~----~----~------~----~------~--~---
