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  1. Minder

    Choosing the right current sensing resistor.

    The L620 has a sense pin which is the bottom of the H-bridge, a low value resistor is normally connected to this and common and the volt drop monitored for any overcurrent. Typically use 0.5ohms. Although I see the L620 has a sense pin for setting the current? The likes of the L297 monitor this...
  2. Minder

    Choosing the right current sensing resistor.

    Generally the resistor is in the common return for the H bridge , in many application this is 0.5ohms or less. The dual comparator in the L297 detects this voltage, and controls the output accordingly. Typically there is a sense level pot on vref pin of L297 to set the OC point. The L297 has the...
  3. Minder

    help with IR2110 chips

    OK.
  4. Minder

    help with IR2110 chips

    That wasn't my point,, I would assume that the original purpose of the TFMR was to be mains operated on 115/230 , which if so, make the 115-0-115 the (original) PRIMARY.
  5. Minder

    help with IR2110 chips

    Are you sure you don't have that backwards? "primary side is 55-0-55 and will be in parallel, the secondary is 115-0-115 and is connected at the centre tap" ? Typically that is the reverse (Primary/Secondary}. so that you can connect to 120 or 240 supply. (115-0-115)
  6. Minder

    help with IR2110 chips

    Incidentally you have the values already in post #36 !
  7. Minder

    help with IR2110 chips

    C1- 22uf, C2- 100nf, C3- 22uf, C4-100nf. D1,D2,D3 - UF4007 R1,R2 - 10R, R3,R4 -1K. The other side same values for these components.
  8. Minder

    help with IR2110 chips

    Me? , central Canada.
  9. Minder

    help with IR2110 chips

    Try this.
  10. Minder

    help with IR2110 chips

    Is this good enough?
  11. Minder

    help with IR2110 chips

    Sorry I just got to it, but the low side has to be referenced to GND or supply common. As shown in fig 8
  12. Minder

    help with IR2110 chips

    It doesn't look as user-friendly as the original, but may have to play around with it. You need the numbers from the Mosfet APP notes.
  13. Minder

    help with IR2110 chips

    I think I found someone who has carried it over. https://www.skyworksinc.com/tools/bootstrap-calculator
  14. Minder

    help with IR2110 chips

    Silicone Labs used to have a on line calculator for the Boot-strap cap, It is too bad they appear to have removed it some months ago.
  15. Minder

    help with IR2110 chips

    Did you see this copy.?
  16. Minder

    help with IR2110 chips

    https://tahmidmc.blogspot.com/2013/01/using-high-low-side-driver-ir2110-with.html
  17. Minder

    Learning Electronics for Everyday Practical Reasons Non-Professional

    Appliances are getting a little more involved to trouble shoot, often it is a case of reverting to changing out a circuit board. For e.g. Most modern washing M/C's now use the Fischer-Paykel outrunner BLDC motor, this eliminates the gearbox, so none of the old style induction motor-simple...
  18. Minder

    Converting frequency on US devices (60Hz - 50Hz)

    If this has a Universal motor, (AC/DC) the frequency does not matter.
  19. Minder

    Learning Electronics for Everyday Practical Reasons Non-Professional

    A nice one with good reviews is the AliExpress 1005005575297190 for just over US$20,00, double beam also. FNIRSI-1013D Digital Tablet Oscilloscope Dual Channel 100M Bandwidth
  20. Minder

    Lowering AC Motor RPM's

    The L298 is totally unsuitable for AC (mains powered) motors, which is what the OP appears to be using. Also the L298 is only a DC H-bridge low voltage controller.
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