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  1. Martaine2005

    Calculation of Gate Resistance

    Yes, that’s correct. The math may be correct but the real world characteristics and tolerances of components including circuit board traces all affect the final values. So either a compromise or a slight change of component value can achieve the desired result.
  2. Martaine2005

    Symbol I have found

    Yes is the short answer. But it depends on the circuit. Certainly not a good idea for bi-directional signals like AC. Although you can put them in series. I would stay with what the circuit has and replace like for like. Obviously axial caps can be replaced with radial caps with a little...
  3. Martaine2005

    thrustmaster t300 pcb board component identification XF01

    The red circled component looks like a common mode choke. The blue circled component is a capacitor. What makes you think it’s faulty?. If it is a choke, it will read as a short. The capacitor should not read a short unless it is shorted. Remove from circuit and check it again. Also check the...
  4. Martaine2005

    tiny 12v fan for my miniature models to exhaust humidifier vapor/misthi

    No it’s not!
  5. Martaine2005

    Unknown chip that looks blown

    Is it worth a go ? Absolutely not. Snapon has a lifetime guarantee. Fight it!!. If it fails, Snapon’s guarantee will filter through their buyers and hopefully STOP their over priced rubbish. As a side note. A YouTube channel checks the consistency of strength and durability of Snapon. It is...
  6. Martaine2005

    Unknown chip that looks blown

    I had a Snapon lorry parked near my work. He was in a café. I went inside to see him and he met me afterwards. He rebuilt my 1978 3/4” ratchet there and then. Free of course! What a super star.
  7. Martaine2005

    Unknown chip that looks blown

    Snapon, at least with hand tools carries a lifetime guarantee. Surely a mechanics scan tool should be covered too?
  8. Martaine2005

    Rf remote of 4 led cob flasher light missing

    Looks like a 433MHz but the reality is, it could be any number of frequencies within that range. Can you take a picture of the bar light?. We may be able to find it online with the specifications.
  9. Martaine2005

    Need Repair Advice on Proton 320 Clock Radio

    That’s a good start by recapping. The 80s ‘death caps’ certainly caused many problems in many devices and not just clock radios. I would ask you: did the old caps actually leak onto the PCB?. If so, any trace damage?. Any glue like substance around larger components?. This can also turn...
  10. Martaine2005

    HAM radio operation

    That looks like my UV5Rs. Very easy to use, but I don’t do HAM bands. Simply walkie talkies and all programmed for the PMR channels that are legal in the UK.
  11. Martaine2005

    Connector identification

    Or…. Take a photo with google photo search?. I’ve had good results with it in the past. Regarding the mirror image, maybe it is a mirrored image?. I see that a lot on eBay.
  12. Martaine2005

    Connector identification

    Alibaba and Aliexpress seem to have plenty in all sizes. Do a google image search for “7 pin pcb mount battery connector “. You’ll need to measure yours and also the pin pitch etc. Failing that, get in touch with them and send a photo of yours. They may be able to help you.
  13. Martaine2005

    3v step down from 12v

    With the values you have quoted, a 3A adapter will be fine. It’s not the maximum current (Amps) that the adapter can supply. It’s the consumption of Amps that the connected bubbler and other electronics require (consume) that is important. So adding them up is important to make sure that the...
  14. Martaine2005

    3v step down from 12v

    Then your adapter will be fine. You will still need a 12V DC input to a 5V DC output for the bubbler. Any of the bottom three links will work and so will the car adapter that @Harald Kapp linked to because it already has a USB connector.
  15. Martaine2005

    3v step down from 12v

    Let’s try and make this simple to understand so that you can understand us. Your home has outlets with 220V ac. Your adapter is powered by the 220VAC (input) and converts that to 12V DC (output). You will require a DC to DC 12V input to 5V output. I believe this has already been suggested to you...
  16. Martaine2005

    3v step down from 12v

    So you have an inverter? You have a 12V source and boost it to 220V?.
  17. Martaine2005

    3v step down from 12v

    Any of the bottom three links will work fine. But first of all, explain what you mean by your outlet is 12V?. Do you mean that you already have a power supply with a 12V output?. Is that a 120V/240V to 12V adapter? (Walwart)?.
  18. Martaine2005

    3v step down from 12v

    The top two links don’t work for me. The next three do. If you really want 3.3V, then the middle link is the best option. 12V to 3.3V and other voltages. Input and output is clearly explained in the title. 12V to 3.3V. 12V is the input and 3.3V is the output. If you want 5V, then any of the...
  19. Martaine2005

    Connector identification

    Give us more details. What’s its use?, a laptop?, a tool?, a motor/fan driver?. As far as I can tell, it’s a 7 pin connector. Without more details, it’s impossible to say.
  20. Martaine2005

    Research Student Interested in Electronics and Embedded Systems

    Welcome aboard @olivia_49
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