truclacicr stj Thank you so much, this will give me a better understanding of what is going on with this circuit..
I will also take some time to go back (trace back) all the traces, connections and components to ensure that I have not made a silly error.. this will hopefully rule out any head scratching from both yours STJ's and anyone else who is looking at this.
I think I might have rushed this one a little too quickly in the hope that I could have fixed it quickly for my friend.
She has been without the solar fountain for some time now so I might take some...
Techie_hobby1
Senior Member
Last Activity: 08-20-2025, 01:48 PM
Joined: 02-24-2023
Location: London
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truclacicr stj
I stand corrected it is definitely not a CN3302 because after looking at the typical applications it mentions MOSFET's in the design which we know these are NPN and PNP transistors and GND is Pin 4 on this IC
I have had to put this one aside for a few days as I have been given something else to take a look at..but would really be grateful of any further assistance. I have been searching through those IC's and none of the pin configurations seem to match up
I had a light bulb moment where I thought the IC might just have been a Boost Regulator which can be...Leave a comment:
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truclacicr Yes that is correct, the DC + & DC- are what the pump motor connects to.
truclacicr stj - so am I right in thinking that these Batteries don't actually charge up at all??
Ideally this circuit needs altering so that it can charge the batteries during the sunlight, and then once charged when sunlight switches to sunset have the batteries take over and power the circuit for as long as they can.
stj - re NiMh cells, do they require a BMS like Li-Ion cells require.
So we are still unsure what the IC is.. I took a look at some...Leave a comment:
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stjtruclacicr
im still having a few difficulties with this circuit.
i have tried reaching to other sites but they too are not coming back with anything useful.
i swapped out the battery pack for 2 x 3500mAh cells and it seemed to work for about a week, but now it seems like they are not charging.
How would be a good way to test that these are actually charging with the sun???
Regarding that 8 pin IC..still unsure what it is and how I can identify it???...Leave a comment:
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adamok7 perfect thank you.. and from that I have been able to locate the correct datasheet 8252...Leave a comment:
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Help identifying a component please
Struggling to identify this component.
I thought it might be an Linear Regulator but the pins in the circuit don’t seem to correspond
Many thanks -
stl truclacicr
Very quickly hand drawn a schematic - could have switched a few things around but think you get the jist...Leave a comment:
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truclacicr
Now I am really baffled.. I have just realised it does not have any connection to pin 3 (Ouput) so can't be a 555 timer can it...Leave a comment:
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truclacicr
whoops I forgot to include pin 7 of the IC, which connects to the base of NPN Q5 transistor...Leave a comment:
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stj
Thank you for pointing that out. I actually didn't see that one. I think I managed to locate a few that were broken/cracked.. and still going through them slowly...Leave a comment:
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truclacicr
Thanks as always. I think sometimes I over think it in regard to the component searching, and try to use the sites that let you search by the Marking code, instead of trying to do a standard google image search first.
In regard to the IC 8pin SOIC connections are as follows ( I think it is just 555 timer chip - but just want some clarification please):
Pins are as follows:
Pin 1 connected to Cathode of D1 diode and bridged with pin 4
Pin 4 goes to collector of PNP (Q3) transistor via current limiting resistor
Pin 2 goes to collector of NPN (Q4)and...Leave a comment:
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Help please with identification of few components for troubleshooting (Solar Water Fountain circuit)
Need some help please with a few components on this small board so that I can troubleshoot the circuit.
The PCB is a Single sided board fairly simple circuitry has a +ve and -ve Solar cell power input, a 7.4v 1500mAh (dual 18630 cell) power in which the Solar panel charges the cells, and lastly the Output goes to a DC connector...
J1 is actually 1P1T Switch (in ON position completes Battery cell circuit
J2 - to DC Output
J3 is Battery cell connector
however I am struggling to identify if:
Y1 (SOT-23) are NPN Transistors, MOSFET's or 11v Zener's....
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