Schematics > Miscellaneous > Time Delay Relay II
Time Delay Relay II
By jawaharlal@excite.com
- When activated by pressing a button, this time delay relay will activate a
load after a specified amount of time. This time is adjustable to whatever you
want simply by changing the value of a resistor and/or capacitor. The current
capacity of the circuit is only limited by what kind of relay you decide to
use.
Schematic
Parts:
| Part |
Total Qty. |
Description |
Substitutions |
| C1 |
1 |
See Notes |
|
| R1 |
1 |
See Notes |
|
| D1 |
1 |
1N914 Diode |
|
| U1 |
1 |
4011 CMOS NAND Gate IC |
|
| K1 |
1 |
6V Relay |
|
| S1 |
1 |
Normally Open Push Button Switch |
|
| MISC |
1 |
Board, Wire, Socket For U1 |
|
Notes:
1. Email jawaharlal@excite.com
with comments, questions, etc.
2. To calculate the time delay, use the equation R1 * C1 * 0.85=T, where R1
is the value of R1 in Ohms, C1 is the value of C1 in uF, and T is the time delay
in seconds.
3. S1 may be replaced with an NPN transistor so the circuit can be triggered
by a computer, other circuits, etc.
4. Most any 6V relay will work for K1. If you use a large relay, you my need
to add a transistor to the output of the circuit in order to drive the larger
load.
Title: Time Delay Relay II
Source: www.aaroncake.net/circuits/
Published on: 2005-02-10
Reads: 355
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