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  1. CDRIVE

    Half bridge inverter

    Where? I don't see them. Chris
  2. CDRIVE

    Half bridge inverter

    That's what I see too! Chris
  3. CDRIVE

    Amplifying current in a sine wave

    TedA made some very insightful observations. I'm surprised macabnv hasn't responded. Chris
  4. CDRIVE

    Connecting cable to a pcb pin with electrical tape

    For operations other than breadboard testing .... EVERYTHING! Even then they're dubious. Chris
  5. CDRIVE

    Half bridge inverter

    Your MOSFET output circuit doesn't look correct to me. Please post the link to where you found your schematic. Chris
  6. CDRIVE

    Connecting cable to a pcb pin with electrical tape

    All kidding aside please post a clear photo. Tape or no tape. Electrical or Duck, what you're describing will not provide a reliable connection. Chris
  7. CDRIVE

    Help amplifying a tiny current

    Actually the 10KΩ isn't the only sink path between Vcc and DO. There's an LED and series 1KΩ in parallel with it. Personally I would try driving the SSR with the board as is. If the SSR needs more drive current I would jump the LED. This would provide a source resistance of 909Ω. With the SSR...
  8. CDRIVE

    Help amplifying a tiny current

    I would think that paralleling the 10KΩ with a 1KΩ should do the trick and eliminate the need for an NPN driver. Chris
  9. CDRIVE

    Auto reversing polarity after a few milliseconds (for solenoid control)

    Harald, I thought I'd post the description as I see it in English. This is only because you may see it in German. Chinese descriptions always makes me smile... Chris
  10. CDRIVE

    Connecting cable to a pcb pin with electrical tape

    To a Redneck the introduction of Duct Tape trumps the wheel! :D Chris
  11. CDRIVE

    Auto reversing polarity after a few milliseconds (for solenoid control)

    That was just a knee jerk reaction after reading the description. Most of the world does a reasonable job of translation into English; with exception of the Chinese. No matter though. I regularly purchase direct from China items on Ebay because their prices are just one level above them paying...
  12. CDRIVE

    nRF24L01+ PA LNA - Seems that the PA (power amplification) portion of the module is failing?

    Yes, I left the house, headed for my watering hole (don't do smart phones) and while driving there questioned myself about the low overhead statement I made. Especially since the regulator contained the "LDO" designation. No argument there but I still think that large capacitance on the output...
  13. CDRIVE

    nRF24L01+ PA LNA - Seems that the PA (power amplification) portion of the module is failing?

    Looking at this schematic you have far too much capacitance on the output of the 5V regulator too. Also, sourcing the 3V regulator with 5V doesn't provide much input overhead. My 'guess' is that if I checked the datasheet lower limit, 5V would be considered borderline. Chris
  14. CDRIVE

    nRF24L01+ PA LNA - Seems that the PA (power amplification) portion of the module is failing?

    That's much to much capacitance on the Output pin. You should be following the Datasheet recommendations which is only 1uF. Heavily loading a regulator output with capacitance can cause instability including breaking into oscillation. Chris
  15. CDRIVE

    Very slow sewing machine motor operation.

    Yup, the intermediate (pulley + shaft + bearings) assembly is called a "Jack Shaft". Chris
  16. CDRIVE

    Very slow sewing machine motor operation.

    Do you need to preserve the max RPM of the motor? If not you may be able to replace the motor with a Gear Motor. You will loose the top sewing speed you now have but gain very good slow speed operation with plenty of torque. Chris
  17. CDRIVE

    Component Help

    It will have to comply with whatever regulating agency (FCC in the U.S.) controls RF transmission in the U.K. I'm sure there's a PO limit that can't be exceeded. You'll need to research that. Chris
  18. CDRIVE

    Auto reversing polarity after a few milliseconds (for solenoid control)

    Harald, I see that the seller is in Germany but after reading the product description (Pigeon English) it looks more like a Chinese seller with a Germany address. :) Chris
  19. CDRIVE

    Auto reversing polarity after a few milliseconds (for solenoid control)

    MPJA is a favorite supplier of mine which stocks this at direct from China prices but you will have to pay shipping. http://www.mpja.com/H-Bridge-Power-Driver-Dual-Channel-L9110/productinfo/31596+MP MPJA's part number is different than this Datasheet for that H-Bridge but it's the same item...
  20. CDRIVE

    Auto reversing polarity after a few milliseconds (for solenoid control)

    It's unfortunate that Alec's two circuit contributions (Posts 16 & 17) is beyond Adam's comfort zone. They're reminiscent of Kris' circuits that usually were discrete as possible and always evoked a smile because they contained an element of "clever". :cool: Adam, if you want really simple it...
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