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    Measuring roller skate wheel rotation

    Hello all,   What about using a non contact tachometer that uses a refelective tape applied to the rotating surface? This would eliminate or reduce any balance problems using magnets and weights. Take a look at the link for one. rfranzk.         ...
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    Electric Fence Indicator/Display.

    Hello and Thanks!!!   Thanks HTG for the schematic and eagle files. Just had a chance to look at them this p.m.  A couple of questions.  On the resistors you don't have specified wattage.  I am assuming 1/4 watt is good for this?? On the caps, just a ceramic?? or is tantalum or some other type a...
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    Electric Fence Indicator/Display.

    Thanks for your input HERO999, I was curious about the low current as well. With capacitive coupling would you still recommend the 50v/2ma neon bulb??    All I want is a visual of fence operation from a distance of 1/4 to 1/2 mile.  I would like to have a high and low voltage indicator to...
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    Electric Fence Indicator/Display.

    Thanks for the quick reply HTG,   Great idea of winding a few turns around the fence a sort of current transformer.  Any recommendations on gauge of wire??  What about having multiple lights for multiple voltage outputs??  Would this be accomplished with multiple xformers, or one with multiple...
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    Electric Fence Indicator/Display.

    Hello all,   I want to build a two or three light display that is driven by the fence charger and can be seen from 1/4 to 1/2 mile away.  I was thinking of using a voltage divider network and either xenon or neon tubes with reflectors and lenses. The bulbs I am considering are neon standard...
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    AC Clamp on current meter to measure dc current??

    Thanks for your reply.  I guess I will either have to pony up and purchase one or put another project on the burner. I appreciate the input. I would be interested in schematics for a dc clamp on meter.  Thanks. rfranzk
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    AC Clamp on current meter to measure dc current??

    Hello Everyone.  I have a fairly inexpensive clamp on multimeter with ac current capabilities 20 amps to 400 amps.  I work more with dc and am curious if a modification could be made to read dc current with some accuracy.  I sometimes measure currents at 300 to 400 amps dc with voltages between...
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    Spot Welder for batteries

    Hello folks:   I made a spot welder based on this one using 2 farad capacitor for stereo system woofer a power supply, large triac and some cables. check it out. rfranzk. http://www.philpem.me.uk/welder/
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    Thermal Protection for Battery Pack

    Hi Ante!!   Yes it is a polymer positive temperature coefficient switch!! I am curious about using them to protect the batteries of a cordless tool during the charge process. Most battery packs use a thermal circuit breaker that measures battery temperature and cuts off charge current.       ...
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    Thermal Protection for Battery Pack

    Hi Ante!!!   I have welded a few battery packs with my capacitive discharge welder and am looking for a source for the pepi thermal fuses, or information on how to configure pptc device to battery pack. The pptc resistance changes with temperature and I am unsure how temperature rises during the...
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    Led display Digital Voltmeter question

    Hi auidoguru.   Thanks for the quick reply. I knew this was the case with analog vein type meters but was unsure about the digital displays.  I will dig up schematics and possible photos of completed stuff.  ps. I made the supply to power a capacitive discharge welder for welding battery...
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    Led display Digital Voltmeter question

    Hello everyone.   I would like to have a digital ammeter to add to my recently completed 0-30 volt power supply. Is supposed to have a 30 amp capacity. Have not tested it that hard at this point. Can this meter be easily modified to read current??? Thanks in advance for any help  rfranzk
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    Micro Spot Welder

    Hi Ante!!   I have been distracted lately. Moved and some other stuff and still don't have internet service at my home.  I did complete a capacitive discharge welder with an adjustable power supply (just completed) a 2 farad audio capacitor and large triac to trigger the discharge. Works well...
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    Micro Spot Welder

    Hi Ante,   I have not measured voltage drops. Good idea !! I have tried brass, aluminum and copper contacts. I have tried different tip and contact areas and shapes. I have some tungsten contacts I can try. Havn't yet.   I will have to dig up a digital camera to send photos.   I do not...
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    Micro Spot Welder

    Hi Ante,
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    Micro Spot Welder

    HI ANTE:   What would be your suggestions?? Would you try to use a transformer setup to achieve higher current?? Thanks rfranzk
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    Micro Spot Welder

    Hi Ante   Found another site with hopeful access to good schematics at roborific.com. This appears to be just what I am lookng for and is microcontrolled for accuracy and safety.  Take a look.  Thanks for your interest so far.  rfranzk
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    Micro Spot Welder

    I have done a little more research on this potential project and the ones I've seen appear to charge and discharge capacitors of up to 1 to 2 farads.  I'm curious whether the discharge is directly to the piece  of work or whether it is discharged into a step down transformer???  Also curious...
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    Micro Spot Welder

    I am interested in buliding a micro spot welder for assembling battery packs and or other small items. Has anyone seen plans for one of these???
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    High Voltage Stun Gun !

    I have completed this project and found nice output transformers at amazing1.com. I used the secondary of the output transformer for some nice kv voltage. This circuit will also drive an automotive ignition coil for approximately 40kv at this time using 8 AA batteries for power supply.
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