| Author |
 Topic  |
|
|
doors
New Member
4 Posts |
 Posted - Mar 02 2015 : 11:20:00 AM
|
You often see a mechanical timer switch on the wall in stairwells of communal blocks of flats. You depress the button into its housing making a circuit, and the light comes on. The button then gradually returns to it's normal state, the circuit is broken and the light goes out. Can I create this process with electronics ? I will only be using a 6v dc current. I have little knowledge of electronics, a 2hr fiasco of trying to assemble a crystal powered radio with my dad fifty years ago put me off for life, so will probably be buying a ready made circuit. I've seen a delay timer relay circuit which switches the current after a set period, but it needs a constant current, which then has to be cut before being turned back on, to restart the timer. In essence I need a momentary on/off switch to trigger a delay timer relay. Is there such a circuit that is sold commercially and what is it called, or will it have to be created from scratch ?
Thanks for any assistance. |
|
|
Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Mar 08 2015 : 12:00:20 PM
|
| Typically it would be something like the touch switch circuit on this website, combined with a monostable 555 timer driving a relay. Such as the circuit found here: http://www.bowdenshobbycircuits.info/page9.htm |
 |
|
|
kanwal
New Member
Pakistan
1 Posts |
Posted - Mar 21 2015 : 07:47:55 AM
|
Thanks Juan. My problem is this,I know very little about winding transformers and I require a little guidance on the layering of the secondary coils. How do I configure the end of one layer and the start of the next. For example, if winding clockwise from left to right, once I reach the end and insulate the coil do I just wind clockwise from right to left the next layer of the secondary or ... ? Any help with this would be greatly appreciated.
|
Atif |
|
|
| |
Topic |
|
|
|
What is needed for touch switch timer ?
