|
|||||||
| Home | Forums | Articles | Links | Blogs | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
| Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc. |
|
We're saving for a new server - help us to serve you by Donating Today and become a friend with benefits!
Ads on/off / Custom Title / 2009 Tshirt / More PMs / Bigger Images / Advanced printing |
|
![]() |
|
|
Thread Tools |
|
|
#1 |
|
diyAudio Member
|
hi, i'm looking at using a 555 timer circuit activated by a LDR to get a delayed step function. ie, when gets dark, voltage divider + LDR causes the 555 give a step function 5 seconds after the LDR senses that its dark.
i'm quite new to electronics and haven't played with 555s b4 but would like to use it in one of my current circuits. could anyone pls help supply me a simple schematic or something? thanks |
|
|
|
#2 |
|
Did it Himself
diyAudio Member
|
A 555 timer won't do that. It will simply change state upon detecting dark then latch for 5 secs.
What you need is a comparator followed by a delayed turn-on circuit. A resistor-capacitor network will provide the delay. I'm not going to hold your hand all the way and give you circuits because any half decent textbook on op-amps and basic electronics out there will have plenty.
__________________
And yes, there are capacitors in the circuit. One is even employed to form the dreaded bootstrap on the voltage gain stage. Get over it. -Burning Amplifier #2, Nelson Pass www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
|
![]() |
| Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Single coil latching relay control?? | cal34 | Parts | 0 | 15th February 2009 09:33 PM |
| control a latching relay with one switch? | bluebeard | Parts | 13 | 8th January 2009 05:24 AM |
| Driving a latching relay | Nixie | Parts | 5 | 28th August 2008 08:41 AM |
| Using latching signal relay in SE guitar amp. | G | Tubes / Valves | 3 | 22nd March 2005 01:08 PM |
| Mini Latching Relay in DIP package | owel | Parts | 1 | 12th May 2004 08:46 PM |
| New To Site? | Need Help? |
| Page generated in 0.11274290 seconds (59.74% PHP - 40.26% MySQL) with 10 queries |