Recent content by peterlonz

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    powering a cordless drill with PSU in drill press DIY build

    Thanks for the replies. I did have at one time,a treadmill motor but no longer & I don't fancy my chances of getting another at low cost. To dave9 I think it's unlikely that a drill stall will occur, generally you'd have nouse to back off & even corded drills can stall but mostly don't burn...
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    not so cordless drill

    An old post I know. But some info I have gleaned while thinking along similar lines: Good cordless drills can almost match corded drills in power output. Typically a corded drill is rated around 450W, depending upon type brand & size. If a PC ATX PSU is considered you are limited to 12VDC &...
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    powering a cordless drill with PSU in drill press DIY build

    Prompted by several DIY builds on YouTube I decided that I should build a drill press. All the examples on YT used a budget commercial corded drill, generally single speed typically valued at about $50. I happen to have a 24VDC battery drill for which batteries are no longer available. So I...
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    Changing out Electrolytic Caps for Polymer Ones

    Again I note the disparity of views on the subject of caps, their properties, construction, typical use, specs & interchangeability. Not sure why the OP needed to use a reflo station for cap replacement, or even if the caps needed to be board mounted. And how did he determine the caps had...
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    Hello, Welcome! (Introduce yourself)

    I'm "newish" here & I guess I don't properly yet know the ropes. Today I received this message: "peterlonz, carlsweden replied to a thread you are watching at Electronics Forums." problem now is; I see no way (after experimenting for some time) of accessing this message. Some guidance...
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    14.4 V Lithium battery - re-purposing question

    Thanks to those kind folk who responded.Answering some of the questions: 1) The battery does have 5 "slots" but it appears only 3 actually have the sliding contacts to allow a male part to engage. 2) I had supposed 2 slots were for discharging to a power tool. One was to monitor battery...
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    14.4 V Lithium battery - re-purposing question

    I have a portable power tool battery, Lithium-ion, brand Einhell, 14.4V, 1300mAh. This battery, though maybe over one year old, has seen no use. The tool (drill) & original battery & charger are not compatible due to model/design changes . So I figured why not use this battery as the basis of...
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    240VAC Transformer based 12 VDC PSU - Problem

    It appears that opinions vary widely on the use of tantalum caps. If they are recommended in application notes from a recognised manufacturer, I can't see a good reason to steer clear, particularly as here I think we are still talking about a 12V LDO regulator?
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    240VAC Transformer based 12 VDC PSU - Problem

    Been wondering why I ever chose an LDO Reg in the first instance. Would not a plain Reg do the job, although I guess regulation losses would be about the same? No idea yet if a tantalum would still be required? Also to spread the loss inevitable in such a design would it not be wise to now fit...
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    240VAC Transformer based 12 VDC PSU - Problem

    I had read the specs but to some extent they are contradictory (on the tantalum output caps) & I note only the spec summaries show Max Vout as 18V. Compare page 2 spec sheet statement: "Maximum Input to Output Voltage Differential: LM1085-12 =18V" (IE a differential). Anyway I am new to this...
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    240VAC Transformer based 12 VDC PSU - Problem

    Output of tranni measured on AC scale DC scale not considered. I am referring not to a plug pack but a conventional transformer. Clear well lit pics very hard on ordinary phone camera, particularly with point to point wiring - it looks a bit like a rat's nest. My next build I will allow more...
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    240VAC Transformer based 12 VDC PSU - Problem

    " but before we continue answer the earlier Q's of mine " Ok here goes: 1) Transformer Vout (no load) = 12.9-13.0 VAC 2) Regulator, under no load: Vin = 16.8VDC; Vout12VDC 3) Across smoothing caps (Reg disconnected) = 17.4VDC PSU on only long enough to take readings but no heat build up at Reg...
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    240VAC Transformer based 12 VDC PSU - Problem

    The case cover (top & sides) is aluminium; chassis front,back & base is 16 mm plywood. The aluminium portion is connected to mains earth for safety as is transformer chassis. I doubt this is an LDO oscillation problem, or that the heat sink was being touched because this was a fairly sudden...
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    240VAC Transformer based 12 VDC PSU - Problem

    OK, sorry about delay in responding. Mislaid my original file on this build. It's point to point wired so pics may not help much - working on that anyway. Meantime details are: As-built details: Wiring: Point to point (no Circuit board) Mains supply 3...
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    240VAC Transformer based 12 VDC PSU - Problem

    Hello, I have just discovered that my "trusty" DIY PSU no longer outputs 12V. I see in fact about 0.5V The unit has been very reliable over the 6 year in intermittent operation; until now. I removed the cover & quickly found (under no load) the LM1085 IT-12 regulator (3A, fiixed 12V LDO output)...
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