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  1. kellys_eye

    Add BlueTooth Audio Transmitter to Amplifier?

    Connect your headphones to these pins. Power the transmitter from a USB power source and use an adapter to change the mini stereo plug to 1/4" plug (guitar standard?) and plug it straight into your guitar. I'm assuming the BT transmitter will be sensitive enough to pick up the guitar signal...
  2. kellys_eye

    Help needed to build a Simple radio to generate a tone

    Two-pole push-button switch, one pole switching a simple audio oscillator connected to the microphone audio input and the other pole across the PTT switch. If the microphone/PTT you currently use plugs into a socket then you could put the oscillator and switch in a separate box mounted...
  3. kellys_eye

    Networked / connected outdoor solar lights

    It's more likely that any solar version would have Ni-cad than Lithium fitted. Lithium requires careful supply/regulation circuitry whilst Ni-cads are often simply charged via a current limiting resistor. That said, EVERY battery will suffer during cold weather to some extent or other. You...
  4. kellys_eye

    PSU transformer repair completed

    Properly known as 'stand-offs' and available as an actual 'component' from various suppliers. I've used cut-off lengths of plastic pen casing to achieve the same result (coz I'm a cheapskate).
  5. kellys_eye

    Add BlueTooth Audio Transmitter to Amplifier?

    You would use some form of attenuation (volume control) between your headphone output and the BT audio input. This is usually necessary to match the signal level (input) requirement of the BT device which itself will take a VERY LOW level signal (something too small to drive headphones...
  6. kellys_eye

    Need Help with a Project

    Multi-pole change-over PUSH buttons are still available.
  7. kellys_eye

    Common mode choke - short?

    Input is on 1 and 4, output on 2 and 3. Your connection is effectively shorting the input.
  8. kellys_eye

    Networked / connected outdoor solar lights

    Solar versions have batteries in them too so whatever concerns you seem to have over 'batteries' is somewhat misplaced. It's also possible to mount the PIR/motion sensor remotely from the light you want to activate so you're not restricted in the area of sensing.
  9. kellys_eye

    Want to create a project using Raspberry Pi and E-ink Display

    I'd recommend you look at marine navigation equipment and design some displays for daylight reading. A decent chart plotter (for example) needs a VERY bright display for daylight working so an e-ink version would be useful. I suspect there are already e-ink displays for other instruments (wind...
  10. kellys_eye

    Help with SMD component identification

    Measuring them is straightforward enough - there are tools to do it as you already have and know about. It's lining the little buggers up that's the problem and short of a proper SMD pick'n'place machine the best (potential) way is to cover a piece of card in double-sided sticky tape and toss...
  11. kellys_eye

    Help with SMD component identification

    Been there, done that - including the not-to-be-mentioned 'chuck them in the bin'. If you assess your actual need for these parts on a "I'm not acting all OCD about it" basis (nothing wrong with OCD - I suffer to a small extent myself and if you saw my workshop you'd agree with the diagnosis -...
  12. kellys_eye

    Surplus components

    Put them on eBay.
  13. kellys_eye

    RCA F19207BC (CRT TV) shuts itself off even after new HOT install.

    Are the legs of Q113F (first pic) shorted? i.e. touching?
  14. kellys_eye

    PS-LX350H Sony Turntable no motor movement

    Work backwards from the motor until you discover the point at which the voltage is missing. On the speed control (relay) board, using the black wire connection as ground, what voltages do you measure on the other coloured wires (poke your test lead down on to the visible metal connectors)...
  15. kellys_eye

    Cat collar

    Sati satisfaction brought it back. (to finish that phrase).
  16. kellys_eye

    wich oscilloscope is better

    Youtube have reviews on both models - the Fnirsi doesn't fare well in many of them. Their newer models may be better but Hantek have been around longer and, at least, have a reputation you can check on.
  17. kellys_eye

    cordless motor project

    Modifying housings to take different motors will wear you down quicker than the tool does..... no motor is going to be particularly quiet on its own. As I mention, it's all down to physical housing and vibration mounting to keep any motor quiet. As for not pulling 1/3hp.... no, most motors...
  18. kellys_eye

    cordless motor project

    Worst case, a 1/3hp motor is around 250watts. At 12V this would mean a motor drawing 20 amps from a battery so your typical 4-5Ahr Dewalt would last 10 minutes - if you're lucky (and it doesn't overload the battery). Motors are relatively easily 'silenced' by mounting them in an enclosure with...
  19. kellys_eye

    Which is more important more current or more voltage when charging 12 volts 100 ah lithium batttery

    Transformers don't work with DC
  20. kellys_eye

    Which is more important more current or more voltage when charging 12 volts 100 ah lithium batttery

    What voltage is your lithium battery? Assuming 12V...... More current = shorter charging time but you must meet the absolute minimum voltage levels required to charge the battery in the first place and 12V won't cut it. Use the right charge-controller for the system and leave it to its own...
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