manz
New Member
hi again...
I`ve built a "power-on time delay relay" from a circuit that I got somewhere on the net (can`t remember where).It is to switch on something (could be anything,depends on the connection of the relay) after certain amount of time.
The problem :
1. At first the timer seems to work perfectly but after a few time using it, the timer just failed to work (but on,just not delayed)
The situation:
1. I know it could be easier if I paste the circuit here but I just dont have the schematic in the computer.It is very simple and i just draw it and didnt save the schematic.
2. I tested it by using the ac to dc adaptor (input: 240v/50Hz)rated output :12v dc /500mA/9W and it works perfectly ok even after many times using it.
3.Then I transfered the circuit to be used in the car powered by the car battery rated 12v dc / 65AH and after several time using it, the timer just fail to works.I knew the power supply is so much more different and the circuit failed due to this.(should be).
***For the info, the circuit uses 2 of 2N3904 and 1 of 2N3053, a capacitor and a resistor and a relay.( :idea: hope you can imagine how`s the circuit connection :idea: )
The question:
1. Is it because of the transistor (either 3904 or 3053) input voltage I used to supply it too high?
2. Or is it because of the current supply to high for the circuit?
3. can i use a voltage regulator something like 78L05 or 78L06 or anything (i didn`t know which is on the market other than 78L05,please suggest me) to reduce the feeding voltage to the circuit.because i`m using 6v/9v/12v relay with the circuit..
4.If there is any other way to make the circuit works with the car batt,please let me know.
Since I didn`t put the shematic I know maybe it is hard to help me out but maybe some of you just can do the magic :wink:
if it is realy hard without the shematic, i`ll try work it out to paste it here.
Realy appreciate your help, thanks.
I`ve built a "power-on time delay relay" from a circuit that I got somewhere on the net (can`t remember where).It is to switch on something (could be anything,depends on the connection of the relay) after certain amount of time.
The problem :
1. At first the timer seems to work perfectly but after a few time using it, the timer just failed to work (but on,just not delayed)
The situation:
1. I know it could be easier if I paste the circuit here but I just dont have the schematic in the computer.It is very simple and i just draw it and didnt save the schematic.
2. I tested it by using the ac to dc adaptor (input: 240v/50Hz)rated output :12v dc /500mA/9W and it works perfectly ok even after many times using it.
3.Then I transfered the circuit to be used in the car powered by the car battery rated 12v dc / 65AH and after several time using it, the timer just fail to works.I knew the power supply is so much more different and the circuit failed due to this.(should be).
***For the info, the circuit uses 2 of 2N3904 and 1 of 2N3053, a capacitor and a resistor and a relay.( :idea: hope you can imagine how`s the circuit connection :idea: )
The question:
1. Is it because of the transistor (either 3904 or 3053) input voltage I used to supply it too high?
2. Or is it because of the current supply to high for the circuit?
3. can i use a voltage regulator something like 78L05 or 78L06 or anything (i didn`t know which is on the market other than 78L05,please suggest me) to reduce the feeding voltage to the circuit.because i`m using 6v/9v/12v relay with the circuit..
4.If there is any other way to make the circuit works with the car batt,please let me know.
Since I didn`t put the shematic I know maybe it is hard to help me out but maybe some of you just can do the magic :wink:
if it is realy hard without the shematic, i`ll try work it out to paste it here.
Realy appreciate your help, thanks.