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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by bob4bvm

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    Battery Charger circuit for LiFePo4 12v 20AH battery ?

    Thanks very much Crutschow ! After reading many similar but incomplete references on the subject, the paper you linked is a breath of fresh air :) Finally a clear, concise explanation on the subject. All the others invariably left some mystery hanging over the charging procedure. It seems that...
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    Large sparking from testing radiator fan directly on 12V battery?

    Old thread but i found your replies so amusing, had to comment :) When i was a kid i did the same thing with a starter motor from a V-8 Needless to say the bendix slammed forward with a bang and the 20# starter leapt out of my hands, leaving a nice laceration :) I could write a book of my...
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    Battery Charger circuit for LiFePo4 12v 20AH battery ?

    Yes that's right, but i was wondering about the charge curve. Seems most chargers for this battery type use a varying pattern of CC/CV to fully charge the battery. My simple charger is just a basic DC supply, no current control. As it works out, when i apply around 14.5V the charge current runs...
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    Battery Charger circuit for LiFePo4 12v 20AH battery ?

    Any LiFePo4 experts care to comment on what i am doing for charging ? Thx Bob
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    Do you have abandoned projects?

    Yes, it seems countless ! Problem is i never seem to clean up my electronics bench corner, so I have unfinished projects from as far back as the 70's Bigger problem is, i cannot even identify what many of them were, my record keeping up there has been horrible i guess. But some of them have...
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    Battery Charger circuit for LiFePo4 12v 20AH battery ?

    Hello Tony, Sorry i have not checked in here for a while I have been using a simple 12V lead acid charger for a while now, seems to work ok. Output is a CV 14.5V, and my meter on battery shows an increasing voltage and decreasing current as the battery charges up . I charge at 4.0A max current...
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    I am not as well educated in electrical as most of you

    Huge rabbit hole IMO, far better to do some signal conditioning on the audio signal and use that to drive a std controller for the type of motor you have.
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    Wye connected system

    In a 3-phase power system, be it Wye or Delta, there is no such thing as ""getting the polarity backwards on one of the windings". In order to change phase rotation, you always swap any 2 of the leads. This applies to all std 3-phase equipment, be it motor, xfmr, or whatever. In the case of a...
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    Battery Charger circuit for LiFePo4 12v 20AH battery ?

    Stil looking for this one, anyone have a ckt ? Am i posting this request in the wrong place here ? Thx Bob
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    Motor Reverser

    Thx Dana, That TIDA is just too slick ! Good old T.I. does it again Wish i had seen that when i was building my telescope controls ! Bob
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    Suggestions for an Angle Sensor (one axis)

    For similar requirements, i have usd a few of the inexpensive compltete inclinometer devices readily available on the market. I have paid from $6-9 for these devices, ready to go with backlit LCD display and accuracy to .01* Grab a cheap one of these and see if you can integrate it into your...
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    Battery Charger circuit for LiFePo4 12v 20AH battery ?

    Anyone have a circuit for this ? I understand a lead-acid or SLA charger can be used, but i am unclear how the battery's built-in BMS comes into play here Battery in question is a LiFePo4 12v 20AH . Used to power remote devices, so normal charge/discharge cycles. Can i just use my bench P/S...
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    USB-C connector 'reversible' power pins ?!

    Thanks for your reply and the interesting spec doc ! I guess the 4-wire USB A end must do some kind of fanout to more pins at the C end. I would term my app a "captive" cable as defined in the doc, since i am just hard-wiring to 2 power conductors there to the 5V source Seems like alot of...
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    USB-C connector 'reversible' power pins ?!

    Trying to get my head around the USB-C power delivery... I am powering an ESP32 via the port and just discovered that the cable plugs in either way ! Moreover, the device accepts the power and operates normally in either case... I made the power cable by cutting the "C" end off a cheap USB C...
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    Sine to square wave conversion

    This is up and running. I used the Schmitt ckt above, i had some 74HC132s here so used that. seems to work fine for my appln as noted above. Later i discovered that my particular encoders read fine into the ESP32 if i simply used a pull-down resistor on each encoder channel. So that is the...

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