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  1. CommanderLake

    AOCJY2 10 MHz OCXO time source

    Not sure where to put this so I'll put it here... So I got me a 5 ppb AOCJY2 10 MHz OCXO purely out of scientific curiosity and so far I have established that my Picoscope oscilloscope is 15.4μs/s slow :D so now I want to try using it to keep track of time to see how accurate it is in the long...
  2. CommanderLake

    Designing LED photography strobe power supply

    I've played with a couple of Cree CMA3090 LED's for things like a light that lights up the clouds and a high speed strobe and even using one as a flash connected to a DSLR hot shoe, but one is slightly too weak for that task so I want to try using 4 of them to make a strobe I can use connected...
  3. CommanderLake

    Photon detectors

    I was looking for something on Digikey and I came across this, I knew photon detectors exist but I never looked into how they work, It seems to use a plain old photodiode. I have some 5ns photodiodes and some experimenting showed that its impossible to have the best possible speed and...
  4. CommanderLake

    Crystal oscillator 15pF load

    How can one verify a crystal oscillator has a 15pF load if any kind of testing equipment such as a scope probe adds capacitance to it, it seems impossible to verify the waveform without modifying it?
  5. CommanderLake

    24.576 MHz resonator for audio interface

    I'm considering making my own kick ass S/PDIF DAC using a TI PCM1794A and an ON LC89091JA but I'm stuck on the section in the LC89091JA datasheet page 9 about the resonator, it seems rather "GET IT RIGHT OR DIE" to me, it seems like I need to get the capacitor values right specifically for the...
  6. CommanderLake

    Power indicator LED for 50v+ supply

    I would like to have an indicator LED for the output of a boost converter but a simple resistor>LED would consume about 500mW and require a relatively large 1W resistor and I really don't want to use so much power just to see that the output is live. So Is there a solution that would use less...
  7. CommanderLake

    Canon EOS 6D hot shoe to 5v logic trigger

    Not sure where this thread should go so please move it if required. I'm trying to use the hot shoe of a Canon EOS 6D to trigger a 5v logic circuit for a Picaxe but the pulse from the camera is triangular with a width of about 130nS and a peak of about 950mV which is too small to amplify with...
  8. CommanderLake

    MPS MP4008 PCB design

    I've been designing a PCB for an MP4008 driven LED controller to power a CMA3090-0000-000Q0U0A40G from a car (approximately 13.5-14.5v) to 3.6A at up to 50V and was wondering if there are any experts here who could take a look at my design and point out any possible issues. I use DipTrace, the...
  9. CommanderLake

    Car power to constant current 3.6A 50v boost converter

    I would like to power one of these: http://uk.farnell.com/jsp/search/productdetail.jsp?sku=2816596&CMP=i-bf9f-00001000 from a car current regulated at up to 3.6A 50v, I've spent days searching for the most efficient solution but I cant find a boost converter controller in an easy to use package...
  10. CommanderLake

    Create controlled 50v pulse

    I would like to create a controlled 50v pulse of a configurable duration for a high power LED with less than 4 amps possibly using a Picaxe as I've used one before, so I have 2 questions... 1. Can the picaxe create fairly accurate a pulse down to 1 microsecond, I've not tried. 2. What circuit...
  11. CommanderLake

    Designing a 4th order 3 way crossover

    I'm designing a 4th order 3 way crossover for some 3 way speakers consisting of the following Dayton Audio speakers: ND25TA-4 RS52AN-8 RS225-8 I know very well a speaker is not just a resistor and inductor but thats as close as I can get with my favourite circuit simulator, enable European...
  12. CommanderLake

    Decoupling capacitors

    Can I use a 10µF ceramic instead of a 10µF electrolytic and 0.1µF film with an LM3886 to save space?
  13. CommanderLake

    How would one make a power supply for a 30,000w xenon lamp

    Photonicinduction is my favourite youtuber he's a highly qualified electrician with over 20 years experience on live high voltage lines and I was thinking... He has a 30kW xenon lamp that was made for simulating daylight for high speed video capture for stuff like crash tests...
  14. CommanderLake

    Eye Movement Desensitization Rehabilitation device

    I need to make an EMDR device for my mum because they cost £125 to buy, she is fully qualified. I have the vibrating pods that the patient holds in their hands they have a standard 3.5mm stereo jack and use 0.1 amp at 4.4v, they need to vibrate 1 at a time left right left right and so on at...
  15. CommanderLake

    Ribbon cable 120 ohm?

    Look at THIS ribbon cable, it has an impedance of 120 ohm could somebody explain why a cable would have such an impedance?
  16. CommanderLake

    Simple switching +-5v supply

    I need a symmetric 5v supply for 2x PGA4311's and a 14M2 Picaxe and another for 2x 5v relays, the supply is +-30v so linear regulators would be very hot and inefficient so I need help finding the right IC's for a switching supply and I need them to be easy to solder so if they are surface mount...
  17. CommanderLake

    Power a relay with a zener diode

    I've been designing a 7.1 amplifier board (7 amps and sub out) with built in volume control and I want to add some protection with a DPDT relay that switches the + and - of the smoothing caps to a large resistor to discharge them, the supply will be effectively 61v from + to - so if I use a 47v...
  18. CommanderLake

    PGA4311 bypass caps

    Heres the datasheet: www.ti.com/lit/ds/symlink/pga4311.pdf Look at page 11 figure 5, could somebody please clarify the placement of the bypass capacitors on this IC, theres a 0.1uF on the left side + and - and on the right side theres a 0.1uF on just the negative but connected to the digital...
  19. CommanderLake

    Inverting LM4780 circuit

    I'm looking at designing my own 8 channel amplifier board with 4x LM4780's and the datasheet says an inverting config might reduce THD+N and eliminate the need for the 68μF Ci caps but it says RB on the positive op-amp input to ground needs to be the sum of Rf and Ri when in theory and on the...
  20. CommanderLake

    Amp power of pop

    I got this amp from ebay for my 8 channel preamp I made and when turned off it makes a loud pop and crack, how would I eliminate this on 8 channels?
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