# Search results

1. ### 12V 7.2 AH Sealed lead acid battery charger circuit needed

ya I am using same battery. Can you suggest me any circuit. I am student.
2. ### 12V 7.2 AH Sealed lead acid battery charger circuit needed

No not fast charging .. I am using AMARON QUANTA Battery. I need simple circuit diagram with transformer and diodes and regulator IC to mange change 12V 7.2 AH battery.
3. ### 12V 7.2 AH Sealed lead acid battery charger circuit needed

I search on the forum but cant find satisfactory answer. Therefore creating this new thread. I have 12V 7.2 AH Sealed lead acid battery and want to make a charging circuit from a transformer. please suggest me a simple and best circuit which will give right charging current and voltage. No PWM...
4. ### small boost converter help

hi i want to design an boost conveter in range 4.3v to 7.1 volts .. ouput 15v at current of 750mA .. plz suggest me any circuit.. and i have to drive all circuitary on input supply only.. i.e.4.3v to 7.1 volts only no bias supply ..
5. ### Help me for simple led drive circuit

ya u are right i m using 6v 4.5Ah battery .. but tell me how much minimum voltage at which i can use that battery?
6. ### led driver using bc557

if u exceeds 100ma the BC557 will heat
7. ### Help me for simple led drive circuit

battery max vol 6 volt ,,, minumun volt 4.5 volts, output voltage of regulator 4 v . @1A . and i cannot make inductor bcoz i dont have anything to measure inductance.. as i m engineering student
8. ### Help me for simple led drive circuit

ya ya u r rite my battery is 6volt.. but after use of its voltage starting decreases .. i m saying when it's volyage becomes 4.2 volt :)
9. ### Help me for simple led drive circuit

@goldsmith thanx a lot for that. i will try and reply here . but as how much minimum possible voltage across the 3055 as suppose my battery voltage is 4.2volt then i think its not possible to have 0.2 voly across transister
10. ### Help me for simple led drive circuit

ok give me that circuit . i want to drive more LEDs
11. ### Help me for simple led drive circuit

thats what i need. ---------- Post added at 06:23 ---------- Previous post was at 06:13 ---------- as i need consatnt 4 volt from 6 volt so most preferred ck is of converter using inductor but i don't want to use it .. that's why i m asking ---------- Post added at 06:25 ---------- Previous...
12. ### need rtd and thermocouple amplifier ckt using opamp

use general purpose opamp 741
13. ### Help me for simple led drive circuit

i have 6 volt 4.5Ah battery and want to drive 30 White LED 5mm each LED @ 40mA current with constant current . but my problem is that i have not to use any inductor in the circuit. plz suggest me any circuit. see image i have to give regulated 4 volt to this array from 6 volt battery
14. ### interface PIC16F628A with compute

ok . but my output is in digital already so i think no need to use adc.. ut how to implement it? can anybody give details plz
15. ### interface PIC16F628A with compute

i have made this project Heart rate measurement from fingertip :Embedded Lab now i want to show same result on pc also and want to save it for different persons .. can it be possible? if yes plz help me..
16. ### how to get 5v dc from 24 vdc

LM2576 is best for you as Tahmid said
17. ### Identify Tx and Rx from IR LED pair

thanx .. i will update further, and may circuit is working now..
18. ### Identify Tx and Rx from IR LED pair

thanx a lot to both ---------- Post added at 13:20 ---------- Previous post was at 11:28 ---------- sorry my LED is quit different . it is exactly reversed ... i have checked with mobile camera.. black LED is transmitter
19. ### Identify Tx and Rx from IR LED pair

hi i have brought IR LD pair so plz tell me how i can identify which one is transmitter and receiver.. Note: one LED is blackish and one is transparent
20. ### Make antenna for 3g usb data modem

hi the antenna shon in the figure is not with modem .. i want to make smiler one .. to increase signal strength .