Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
24V lead acid charger information
There are many circuits out there, as there are many opinions on how the charge the batteries. Since they are connected in series you will need a minimum of 27.6 V to charge them. That is 13.8 x 2. If you use the float charge for the batteries that is 13.8VDC...
If you read the writing below the schematic, it says L1 is 17 turns and the tap is 1 turn from the capacitor end. I don't know where you are getting 25uH for it. L2 needs to be some form of iron core from the schematic having the two parallel lines between the primary and secondary.
I have built exactly what you are talking about. My system was fully automatic, charged the battery by day and turned on the Led's at night.
Please tell me how many and what color of Led's you want to turn on at night.
I am not sure how your circuit is planned to work. The ULN2803 will pull each digit to ground with a high input.
If I read the MAX7219 correct, the digits outputs are active high, and since the 2803 uses a active high input the circuit does not need the74HC540. I hope you plan to use...
The volatages vary slightly with ambient temperature, but at 25° C and a 12V battery they are:
Cycle 14.4 to 15V, Float 13.5 to 13.8 Most manufactures recommend limiting the initial charge current to 0.020 x C in amps, and when the charge current of cyclic charger drops to 0.01 x C in amps the...
datasheet ic4060
Here is a data sheet for the 74HC4060, the last page gives a circuit using a crystal.
The standard 4060 will not operate above 6Mhz.
**broken link removed**
There is no need to use a resistor for each LED. Tie all the anodes together and use one resistor from anodes to Vcc. My National Semiconductor data book recommends that R1(resistor connected to pin11)10X greater than R2(resistor connected to pin10) with the 4060 RC oscillator
lm8560 digital clock 24 hr with alarm
Here is a schematic of clock I have built and ran on 12V DC. It uses a crystal and some CMOS IC's for the clock to generate a 60 signal for the clock
how to make a wave generator
Another way to make a 50% duty cycle with the 555 is connect a 1k resistor from pin 3 to Vcc. Tie pins 2 & 6 together. Put the timing resistor from pin 3 to the junction of pins 2 & 6, put the timing capacitor from pins 2 & 6 to ground. The time now becomes...
Most lead-acid batteries can be charged with a constant voltage. For a 12V the best way is the standby method, or between 13.5 and 13.8 volts, for average room temperatue of 68°F. Depending on the size current limiting may be necessary. I would put a diode between the charger and the battery...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
