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  1. flippineck

    Lithium ion cell equivalents

    Looking for a UK supplier for the following: Lithium-ion Moli IMR-26700A 2900mAh 3.8V Cylindrical High Power Cells Specifications Manganese dioxide based Li-ion battery cell 2900mAh, 3.8V, max 40A discharge A number of safety features were designed into the IMR-26700A cell, including thermal...
  2. flippineck

    125 degree C electrolytics by Su'scon

    I'm attempting to repair a 22" HP LCD monitor.which powers up in a very delayed fashin, by replacing the electrolytic capacitors on the power board. I've obtained most of the capacitors I need very easily, but three are proving very hard to obtain the identical spec to that currently fitted...
  3. flippineck

    Combined buck & boost converter?

    I gave up trying to use a car alternator as a wind turbine generator, and simply bought a purpose-made PMA generator as a base for my wind power project. Some idea of the characteristics of the generator (some figures manufacturer-given, others interpolated & guesstimated, I imagine also the...
  4. flippineck

    Auto star-delta PMA alternator switchover

    Trying to convert a car alternator into something suitable for a wind turbine project here. You can buy pre-made PMA alternators for wind turbines on ebay however decent ones are very expensive and virtually all only seem to be available from US-based sellers, which adds a huge postage and tax...
  5. flippineck

    PWM generator

    I need to come up with a cheap and simple Pulse Width Modulation square wave generator with the following parameters: Power source: 12V SLA battery Data low: adjustable (trimmer ok) 0V thru +3V Data high: adjustable (trimmer ok) +5V thru +12V Frequency: adjustable (trimmer ok) 50 -100 Hz Duty...
  6. flippineck

    Do SLA chargers fight if paralleled?

    I have a set of 3 'leisure' SLA batteries, all broadly similar in terms of age and rated capacity, connected in parallel, powering a handful of very low power equipment - a small LED nightlight type device and a small alarm system. Very very occasionally an inverter which supplies 240V AC to...
  7. flippineck

    Lead-acid vehicle battery discharge time

    Assuming a car battery starts out at time zero, three-quarters full and 10% into it's useful lifespan, how long would you expect it to last, switched off with the key out, before it's no longer able to supply enough current to turn the starter motor? Battery type - sealed lead-acid; Drain with...
  8. flippineck

    LC56 A 383 8 PIN DIL IC

    Standard 8 pin DIL IC marked thus: A LC56 ___ 383 It's on a small PCB along with a diode, a red LED, 2 electrolytic caps and an inductor. The PCB is marked ZB195-1 161030 the PCB is attached by 2 flying leads marked V+ and V- to the terminals of a standard car cigarette...
  9. flippineck

    Talking to (ELM327-based?) OBD2 reader's UART over USB-RS232

    I have an OBD2 vehicle fault code reader possibly based on an ELM327 chip. It has an OBD-style plug on one end which is intended to plug into a car diagnostic port, and a USB-B socket on the other end which you plug into a computer USB port. My Windows 7 PC recognised the device over USB and...
  10. flippineck

    Back to back AAA cell whim, bad idea?

    I have a laser spirit level which takes two AAA cells. they slide lengthways into the side of the level, one positive end first, one negative end first. the battery compartment cover has a sheet of copper which connects the two exposed cell ends together, so that the cells end up in series once...
  11. flippineck

    dissipation in a zener diode

    I am experimenting with an unstabilised DC power supply (solar panel array rated at 44V open circuit) which in practise seems to fluctuate up to about 45V open circuit in operation. Could I ensure the output stays at or below 40V by connecting a suitably high power & heatsinked 40V zener diode...
  12. flippineck

    LED PSU board, wondering what it is..

    I have a small circuit board out of a cheap chinese LED light. Live and neutral arrive at the board from a 13A 240V UK AC mains plug. Live then passes through a fuse before arriving on one side of a 0.1uF capacitor. Neutral tracks directly across the board to the other side of the capacitor...
  13. flippineck

    Advice on antifreeze heater?

    Got a problem here with small 12V diaphragm pumps bursting in the cold. They are for feeding water from an outside 1000L storage tank, into a static caravan's plumbing system. Temperatures here in the UK drop below freezing regularly during winter. What's the lowest? I don't really know if I'm...
  14. flippineck

    Getting kids into electronics

    Nearly bought one of those 100-in-1 project kits for my lads 7th birthday today. He's recently demonstrated the ability to read instructions and follow them through ok, by himself. When I actually got to the store and looked at the kit I decided to leave it & he's getting Power Rangers instead...
  15. flippineck

    Amps are big.

    Having spent an evening soldering 12 off, 20W 12V halogen lightbulbs together to create a 'dummy load' to simulate something behind a battery charger eating up the energy supplied by solar panels, I was quite suprised. Rigged them up as six strings of two each series string, all connected in...
  16. flippineck

    Alternatives to lead acid in the hundreds of Ah

    I'm using lead-acid 12V batteries, 'deep cycle' type, 110Ah each for storing solar power. My two batteries are now somewhat degraded through use, disuse and abuse & I was thinking it's probably time to replace them. This is the type I have...
  17. flippineck

    Huawei B593s-22 WiFi Modification

    Attached image is the circuit board of my router. The two SMA connectors at the top of the board, one on either side, are for the cellphone antennas (it's a mobile 4g router). The router has WiFi capability, but no external WiFi antenna port. I can see two small signal connectors bottom right...
  18. flippineck

    impose current ceiling

    I have a supply connected to a load. The load is a constant purely resistive load. The supply voltage fluctuates fairly wildly and is capable of supplying a lot more current into the load, than the load is capable of surviving. I could add a fuse in series and that would impose a specific limit...
  19. flippineck

    Input to a microcontroller

    I'm messing around with a device here which incorporates a small one time programmable microcontroller. It's in a timeswitch, I posted about in the parts info subforum earlier: https://www.electronicspoint.com/threads/18-pin-dil-ic-sh69p-20c-1217-e-018du-n6sny-3-3.278876/ The micro has four 4...
  20. flippineck

    18 pin DIL IC SH69P 20C 1217.E 018DU N6SNY-3-3

    18 pin DIL IC SH69P 20C 1217.E 018DU N6SNY-3-3 Found inside touch-operated timeswitch. Looking for info? maybe this.. http://datasheet4u.com/datasheet-pdf/SinoWealth/SH69P20C/pdf.php?id=932009 http://www.dycmcu.com/data/upload/201402/081654408.pdf Any other info gratefully received. It's...
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