iductive heater cooking on ebay lipo battery

Started by Jan Panteltje in sci.electronics.design6 years ago 9 replies

I got one of these: http://www.ebay.com/itm/391256484917 used it in series with the'unknown' one from my RC plane, so two different 11.1 V...

I got one of these: http://www.ebay.com/itm/391256484917 used it in series with the'unknown' one from my RC plane, so two different 11.1 V lipos: http://panteltje.com/pub/different_lipos_IMG_5475.JPG Charged both batteries with the 'official' RC plane balancing charger: http://panteltje.com/pub/charging_chinese_lipo_with_rc_plane_charger_IMG_5473.JPG Note the large terminal connec...


Harbor Freight battery float charger #42292 circuit?

Started by P E Schoen in sci.electronics.design5 years ago 14 replies

I have one of the cheap ($5) Harbor Freight lead-acid battery float chargers and I found that it was not working (it may have been damaged some...

I have one of the cheap ($5) Harbor Freight lead-acid battery float chargers and I found that it was not working (it may have been damaged some time ago - I had the case open). I traced the circuit and it is basically a FWB and capacitor providing 25 VDC to a 7805 regulator with resistors to set the output to about 13.5 volts. But it also has a TIP41 NPN BJT with a diode and LED to the b...


Big batteries

Started by bitrex in sci.electronics.design5 years ago 23 replies

http://insideevs.com/wp-content/uploads/2016/12/chevrolet-bolt-powertrain-2_002.jpg The first gen Volt's ~12kWh battery is on the far left,...

http://insideevs.com/wp-content/uploads/2016/12/chevrolet-bolt-powertrain-2_002.jpg The first gen Volt's ~12kWh battery is on the far left, then the second gen's ~14kWh battery next, then the Spark EV's ~20kWh, then the Bolt's ~60kWh battery final. 160kW maximum power output from the Bolt's battery, cool. The Volt doesn't have a fast charging option and the onboard charger is limited ...


new 30MHz to 300MHz switcher - worlds smallest laptop adapter

Started by Jamie M in sci.electronics.design8 years ago 64 replies

Hi, Here's a new SMPS switcher apparently coming out next year for...

Hi, Here's a new SMPS switcher apparently coming out next year for laptops: http://phys.org/news/2013-12-circuit-laptop-charger-brick.html It apparently has a "power reclaiming scheme" for higher efficiency, would this be conventional sync rectification or some other thing? It looks like power electronics is in for a big (r)evolution once the 300MHz+ designs start to spread! cheer...


Connect 120 volt circuits to get 240 volts

Started by Anonymous in sci.electronics.design3 years ago 220 replies

For faster charging when not at a public charger a portable way to get 240 volts at a home or business that doesn't have 240 volt outlets is to...

For faster charging when not at a public charger a portable way to get 240 volts at a home or business that doesn't have 240 volt outlets is to pick off two outlets that are wired to separate circuits on opposite sides of the 240 volt power. There is a commercial product for this and designs on the web. I found this schematic. https://cdn.hackaday.io/images/2004701426644738630.


MC34063 Step-down Converter Heating Problem

Started by Anand P. Paralkar in sci.electronics.design10 years ago 21 replies

Hi, I have constructed a DC-DC step-down converter using the MC34063. The circuit I use is very similar to the one shown...

Hi, I have constructed a DC-DC step-down converter using the MC34063. The circuit I use is very similar to the one shown here: http://www.eleccircuit.com/wp-content/uploads/2008/01/ipod-mp3-player-charger-by-mc34063.jpg My circuit does not have the Zener, output side LED and input side protection diodes (TVS1 and D2 in the circuit). The rest of the circuit is quite similar. The...


craftsman 240v welder buzzbox battery charger

Started by Yzordderrex in sci.electronics.design8 years ago 10 replies

I've got a little spare time here at work today so I ran a simulation to us= e welder as interface between 120v line and 12v car battery. It...

I've got a little spare time here at work today so I ran a simulation to us= e welder as interface between 120v line and 12v car battery. It looks like= I can probably put welder on 120v line with a single phase diode bridge on= it and use current knob on welder to control current to charge 12v battery= . Am I totally nuts or Mcguyver?


Motion in support or reject EV charging chip reader?

Started by Ed Lee in sci.electronics.design1 month ago 90 replies

Again: "Cost - $700 million in costs could slow EV charger deployment across California. By CARB’s own calculation, an EMV chip reader...

Again: "Cost - $700 million in costs could slow EV charger deployment across California. By CARB’s own calculation, an EMV chip reader mandate will add approximately $3,000 to the cost of a charging station over its lifetime - $371 for the hardware and $270/year in operations and maintenance (O&M) costs" http://www.evassociation.org/carb.html For: 1. Allow simple an


EV charging price

Started by Anonymous in sci.electronics.design3 years ago 90 replies

We are writing a proposal for a local government trying to facilitate fair pricing of charging, probably with a ChargePoint fast charger. ...

We are writing a proposal for a local government trying to facilitate fair pricing of charging, probably with a ChargePoint fast charger. ChargePoint allows them to set pricing. By the way, Evgo charge $0.15/min (member) and $0.20/min (non-member). Some charge as much as $0.39/min. That's legal highway robbery. Evgo's pricing structure is unfair to older vehicles. Especially for olde...


Haunted By LED Light

Started by amdx in sci.electronics.design10 years ago 38 replies

I'm haunted by LED light! When I wake up there's the LED on the cordless phone charger and the LED display on my alarm clock, also two LEDs...

I'm haunted by LED light! When I wake up there's the LED on the cordless phone charger and the LED display on my alarm clock, also two LEDs on the VCR. I walk in the bathroom there are 3 LEDs on the toothbrush, I walk down the hall and there is a second toothbrush with it's 3 LEDs, then I hit the dining room, where my modem has 5 LEDs and the router has another 6 LEDs plus the Xbox PS h...


Mains wiring question: flush vs. surface load panel

Started by Bob E. in sci.electronics.design9 years ago 7 replies

Installing a charging station in a garage for the new car owner. The charger is surface-mount. The easiest install will be surface mount...

Installing a charging station in a garage for the new car owner. The charger is surface-mount. The easiest install will be surface mount using liquid-tight flex on top of the sheetrock. Problem is that the load panel (nearby, on the same wall) is flush-mount with knockouts (obviously) beneath the 'rock. I'm considering running the flex on the surface and doing a "submarine" trenc...


How do you calculate the REQUIRED voltage from a transformer secondary

Started by Anonymous in sci.electronics.design5 years ago 30 replies

How do you calculate the REQUIRED voltage from a transformer secondary? Ok, here's the plan. A friend of mine installed a bunch of LED...

How do you calculate the REQUIRED voltage from a transformer secondary? Ok, here's the plan. A friend of mine installed a bunch of LED fixtures to run off a solar panel and a 12V marine battery. It's drawing about 15amps at 12VDC. It works fine when the sun is shining, but drains the battery when there is no sun. He said he gets tires of having to hook a battery charger to that battery ...


Using Raw Li-Ion Cells with a Protection Board

Started by sms in sci.electronics.design5 years ago 1 reply

I need a small Li-Ion charger/protection board for a 3 cell (series) pack, i.e....

I need a small Li-Ion charger/protection board for a 3 cell (series) pack, i.e. http://www.tenergy.com/Protection-Circuit-Module-11-1V-Li-Ion-Polymer-15A-Limit. If I understand this correctly, this is for use only with unprotected Li-Ion cells because it has the protection circuit for each of the three cells already on the board. Connecting 12.6V will charge each cell with 4.2V chargi...


Charging high voltage lipos a different approach to cell balancing

Started by Jan Panteltje in sci.electronics.design6 years ago 17 replies

Charging high voltage lipos: a different approach to cell balancing. Faced with 3 11.1 V RC lipos at 2200 mAh to make 33.3 V for 'buffer' for...

Charging high voltage lipos: a different approach to cell balancing. Faced with 3 11.1 V RC lipos at 2200 mAh to make 33.3 V for 'buffer' for cooker, and solar power to charge it , I was wondering... how to safely do cell balancing.. I have seen many schemes, But then had this idea, I once bought 20 pieces of MCP73831T single cell lipo / liion charger chips for < 4$ on ebay, only used


Can a 12 volt regulatred power supply be used to charge car batteries?

Started by Unlisted in sci.electronics.design3 years ago 25 replies

I have a 12volt regulated power supply that was probably made for using automotive CB radios in a house. It's rated at 3 amps. Can this be...

I have a 12volt regulated power supply that was probably made for using automotive CB radios in a house. It's rated at 3 amps. Can this be used to slow charge 12V car batteries? I have a big car battery charger, which puts out 15 or 60 amps, but I want to trickle charge a battery in severe cold weather. I'm more worried about damaging the power supply than the battery.


How to charge a 6V Gel Cell

Started by Anonymous in sci.electronics.design7 years ago 7 replies

How to charge a Gel Cell 6V 4.5Ah. I have an electric fence charger (fencer) for livestock. It has a solar panel to charge the 6V 4.5Ah Gel...

How to charge a Gel Cell 6V 4.5Ah. I have an electric fence charger (fencer) for livestock. It has a solar panel to charge the 6V 4.5Ah Gel Cell. But this fencer has not been used for several years, so the battery is completely discharged. It's likely I'll need to replace the battery, but whether the battery is completely discharged, or brand new, I was told the battery should be pre-char...


"Lockout" load switch with a 4093

Started by bitrex in sci.electronics.design5 years ago

http://imgur.com/a/BiJnL When the USB pin is low and the widget is not connected to the USB LiPo charger, the main load's boost converter...

http://imgur.com/a/BiJnL When the USB pin is low and the widget is not connected to the USB LiPo charger, the main load's boost converter shutdown pin is pulled low (off) by the output of the flipflop section U1. Pulsing button 1 turns the main load on and pulsing button 2 turns it off again. If the widget's main load is powered when USB voltage is connected, differentiator C1/R5 ...