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222 battery circuit

Szabolcs Szigeti All Messages By This Member #151237 Hi, I have made a battery pack for my 222, but interestingly it does not work. It works fine from external power, but not from battery. Closer inspection showed SMD inductors L309 open with burn marks, and L310 seems to be burned, but still ok. I don't have schematics, does anyone have the values of these? Thanks. Szabolcs
Miguel Work All Messages By This Member #151238 Hi Is 222 or a 222A? -----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de Szabolcs Szigeti Enviado el: martes, 25 de septiembre de 2018 19:20 Para: [email protected] Asunto: [TekScopes] 222 battery circuit Hi, I have made a battery pack for my 222, but interestingly it does not work. It works fine from external power, but not from battery. Closer inspection showed SMD inductors L309 open with burn marks, and L310 seems to be burned, but still ok. I don't have schematics, does anyone have the values of these? Thanks. Szabolcs
Szabolcs Szigeti All Messages By This Member #151243 Hi, It's a 222 . Szabolcs Miguel Work <harrimansat@...> ezt írta (id?pont: 2018. szept. 25., Ke 19:45): toggle quoted message Show quoted text Hi Is 222 or a 222A? -----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de Szabolcs Szigeti Enviado el: martes, 25 de septiembre de 2018 19:20 Para: [email protected] Asunto: [TekScopes] 222 battery circuit Hi, I have made a battery pack for my 222, but interestingly it does not work. It works fine from external power, but not from battery. Closer inspection showed SMD inductors L309 open with burn marks, and L310 seems to be burned, but still ok. I don't have schematics, does anyone have the values of these? Thanks. Szabolcs
Miguel Work All Messages By This Member #151247 120uH 108-5082-00 ferrite chip 1712 -----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de Szabolcs Szigeti Enviado el: martes, 25 de septiembre de 2018 19:20 Para: [email protected] Asunto: [TekScopes] 222 battery circuit Hi, I have made a battery pack for my 222, but interestingly it does not work. It works fine from external power, but not from battery. Closer inspection showed SMD inductors L309 open with burn marks, and L310 seems to be burned, but still ok. I don't have schematics, does anyone have the values of these? Thanks. Szabolcs
zenith5106 Member Profile All Messages By This Member #151248 On Tue, Sep 25, 2018 at 07:20 PM, Szabolcs Szigeti wrote: I don't have schematics, does anyone have the values of these? Both 120 uH /H?kan
Miguel Work All Messages By This Member #151249 Yes both, but is only a serial filter, it should work shorted Regards! -----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de zenith5106 Enviado el: martes, 25 de septiembre de 2018 22:54 Para: [email protected] Asunto: Re: [TekScopes] 222 battery circuit On Tue, Sep 25, 2018 at 07:20 PM, Szabolcs Szigeti wrote: I don't have schematics, does anyone have the values of these? Both 120 uH /H?kan
Miguel Work All Messages By This Member #151250 Check your email Regards -----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de zenith5106 Enviado el: martes, 25 de septiembre de 2018 22:54 Para: [email protected] Asunto: Re: [TekScopes] 222 battery circuit On Tue, Sep 25, 2018 at 07:20 PM, Szabolcs Szigeti wrote: I don't have schematics, does anyone have the values of these? Both 120 uH /H?kan
Szabolcs Szigeti All Messages By This Member #151264 Hi, Thanks everyone! Szabolcs zenith5106 <hahi@...> ezt írta (id?pont: 2018. szept. 25., Ke 22:53): toggle quoted message Show quoted text On Tue, Sep 25, 2018 at 07:20 PM, Szabolcs Szigeti wrote: I don't have schematics, does anyone have the values of these? Both 120 uH /H?kan
Alex All Messages By This Member #151288 Hi, what type of battery and voltage are you going to use? Some time ago I did go as far as Installing a 2x 18650 batteries and holder inside the battery bay of my 222 and it works quite well, but I still have to charge the cells on an external charger base. I also connected a very low dropout "super diode" in series with the battery pack to prevent any direct uncontrolled charging when the scope is powered with the external DC adapter. The idea would be to one of these days add one of those inexpensive charger modules sold on ebay so the batteries can be automatically be charged inside the scope. Also another issue is the cutoff low battery voltage originally used by the scope that is set for the 8V lead-Acid battery pack at I think it was 7.5V IIRC, so it is much higher than the ~6.4V (3.2v x2) minimum permissible voltage for the two Lithium cells in series, so the scope turns off prematurely while there is still plenty of juice left in the Lithium cells. My cells actually have an internal Hi/Lo voltage cutoff and protection build-in, so the cells are actually a bit longer than a regular 18650. In any case there is a resistor value in the battery sensing circuit divider chain on the A2 board that needs to be changed to adjust the cutoff point, which is also something I still need to do as well. I have some notes on this info would be useful. One more project on my list waiting for me to get to get back to it. In any case it would be nice if you can post any updates to your project. It might even make me dust off my own and finish. Alex
Szabolcs Szigeti All Messages By This Member #151319 Hi, I was actually looking into the Lithium option, I have found a really neat solution online: But for the time being I went with the old technology, for the simple reason that I had a bunch of NiMH AA cells with solder tabs. So I hot glued 14 of them together 2x7. 2 connected in parallel and then 7 of these pairs in series. Then it got wrapped in kapton tape. It is even about the right size mechanically. I'm not sure if the scope will be able to charge them fully, but the voltages are about right. But I can always charge it externally if needed. So far it works nice, will do some testing. Szabolcs <tekscopegroup@...> ezt írta (id?pont: 2018. szept. 26., Sze, 17:49): toggle quoted message Show quoted text Hi, what type of battery and voltage are you going to use? Some time ago I did go as far as Installing a 2x 18650 batteries and holder inside the battery bay of my 222 and it works quite well, but I still have to charge the cells on an external charger base. I also connected a very low dropout "super diode" in series with the battery pack to prevent any direct uncontrolled charging when the scope is powered with the external DC adapter. The idea would be to one of these days add one of those inexpensive charger modules sold on ebay so the batteries can be automatically be charged inside the scope. Also another issue is the cutoff low battery voltage originally used by the scope that is set for the 8V lead-Acid battery pack at I think it was 7.5V IIRC, so it is much higher than the ~6.4V (3.2v x2) minimum permissible voltage for the two Lithium cells in series, so the scope turns off prematurely while there is still plenty of juice left in the Lithium cells. My cells actually have an internal Hi/Lo voltage cutoff and protection build-in, so the cells are actually a bit longer than a regular 18650. In any case there is a resistor value in the battery sensing circuit divider chain on the A2 board that needs to be changed to adjust the cutoff point, which is also something I still need to do as well. I have some notes on this info would be useful. One more project on my list waiting for me to get to get back to it. In any case it would be nice if you can post any updates to your project. It might even make me dust off my own and finish. Alex
Alex All Messages By This Member #151329 Yes I saw that article some time ago. But he is using a separate charging/supplying the battery voltage with a boost converter to the scope, which requires an additional voltage comparator plus inverter logic to control both modules through an enable input, which most charger modules don't have. There are charging modules out there that handle 2 cells with on-board mosfet switching so that only a single connection for the charge input/ battery output is required. That simplifies the design by allowing transparent charge/discharge operation and do away with any external control logic. Anyhow, looked around a bit and ordered a couple of boards to play with.
Brian Cockburn All Messages By This Member #151330 Hi Alex, Some time ago I did go as far as Installing a 2x 18650 batteries and holder inside the battery bay of my 222 and it works quite well, but I still have to charge the cells on an external charger base. There are chips that are able to charge two Li-ion cells in series. The TP5100 is one such chip. Search for "tp5100 module" to find pre-built modules that don't require you to solder to the tiny chip. This might make an on-board charger you spoke of possible. Cheers, Brian.
Miguel Work All Messages By This Member #151382 My tek 222 is working with lithium -----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de tekscopegroup@... Enviado el: jueves, 27 de septiembre de 2018 16:29 Para: [email protected] Asunto: Re: [TekScopes] 222 battery circuit Yes I saw that article some time ago. But he is using a separate charging/supplying the battery voltage with a boost converter to the scope, which requires an additional voltage comparator plus inverter logic to control both modules through an enable input, which most charger modules don't have. There are charging modules out there that handle 2 cells with on-board mosfet switching so that only a single connection for the charge input/ battery output is required. That simplifies the design by allowing transparent charge/discharge operation and do away with any external control logic. Anyhow, looked around a bit and ordered a couple of boards to play with.

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