I have a wireless portable sound system call a Paso 500
Its a great unit but it has an auto battery cut off when the battery starts going flat. Sounds ok but it really can cut out waaaaay before its due time. The same battery it cuts out will play on another brand's unit perfectly. My question is, can I remove this function and or can I adjust the cut off threshold for it.
No the batt is new and this model has a reputation on cutting out. The main problem is it really comes underpowered, it comes with a non standard size 2.5AH batt. I have spares and can easily replace it when it cuts out but I am a performer and if it cuts out mid song, my show really goes to shit. Can anyone tell me if its possible to by-pass this cut off feature and how to do it? I have ask the company for a technician repair manual but they refused. Any help please.
Well I use radio mics for a living and I always replace the batteries before they fail. You get to know how long they last. It sounds like this battery is running a power amp so the life will vary with load. So replace it for the worse condition. I'd say it's likely they have a very good reason for this auto cutoff at this battery voltage. You can't just magic that reason away. If the life isn't long enough use a larger external battery.
*If you don't pay your exorcist you get repossessed.*
Dave Plowman firstname.lastname@example.org London SW
Can anyone answer my question though. I fully understand the situation (I shouldnt do it, its under powered, its there for a reason). Let me just start again as people are getting hung up on the background. here another scenario: "A person made an amp with an auto batt cut off and I purchased it and wanted to remove it".
OK then. How does it cut off ? Is the power to the main board controlled via a relay, that opens when it detects the low battery condition ? Or does it just cut off silently ? If the former, then it is easy enough to just short the relay conatcts. If the latter, then you need to locate the switching transistor that controls the feed. This should not be too difficult. I would expect it to be either one of the larger D-line package transistors at a minimum, or some type of flatpak package like a TO220. It should be easy enough to follow the battery "+" around the board until you arrive at such a transistor. Once found, it should only be necessary to short its collector and emitter pins, to effect a bypass. If you want to get a bit cleverer, locate the sensing circuit, which is likely based on either an opamp wired as a comparator, or an actual comparator IC, and alter the threshold set point resistor(s)
Hi Arfa, Your the man. I am not too versed in electronics but it does make an very audiable noise when it cuts out and also when it resets. How is the cut off adjusted?? I will rip it apart today and locate the items. can I email you direct. I am more tha n willing to pay you for your time and/or send you some products