Recent content by NickKUK

Rehoused.. and running. Currently I have the sig gen using into it with the scope - this doesn't have any adjustments yet. It's just come off the lightbulb limiter. Video uploading.... This is the XY plot - it hints at the current curve (see the persistence of vision) but it shows the full...

I know.. odd ey! It's probably something like the maximum AC signal Vpp/Ipp given the testing (from memory) was low voltage plus the sig gen is limited in it's current delivery capacity, even in 50R mode. My point here is not all testing is perfect, at the same time A/B testing on a stereo amp...

I've stuck caps on an sig gen and scope, then bode plotted the human range and I didn't find any difference between Panasonic and Wima. Yet the sound difference between them as a cap between a solid state amp pre and power sections was marked. As too vs the old electrolytic that had been fried...

Agreed, in the main audio tends to be film in polyester/polyprop, electrolytic, and then the high frequency tends to be ceramics (microphonic) etc the main target for those is making the wave guides not reflect and bypassing the switching frequencies. Tantalums have fallen out of fashion but the...

Source: https://www.aictech-inc.com/en/valuable-articles/capacitor_foundation04.html The source of this image is very interesting, littered with mathematical witchcraft but it's understandable. Another source would be Panasonic: https://industrial.panasonic.com/ww/ds/ss/technical/lc3 ESR/tan...

When you're designing/selecting the cap there's a tan loss angle (basically ESR) that changes over frequency applied. Typically film caps are fine at higher frequencies but once down in the 100Hz and below, we start seeing some key differences as the ESR on those smaller film caps start...

The more switches and pots are exposed, the more dirt and grime gets in. It's good to play but once the pedal is in use it's likely they're not going to change. I'd prefer a removable metal covers for the toggle switches and pots.

Minimising switching noise. Current flows in loops, and that (being high frequency and with higher harmonics) follows the impedance rather than resistance that DC does. This can mean flow through the components rather than the actual PCB ground planes! Anyone interested may be interested in...

Usually a bit of new solder and wipe on heatup and it’s good to go. Weller tip activator works wonders when the iron has too much oxidation or impurities to clean normally. This is basically an agressive fllux solder. Stick the hot soldering iron in it, take it out and leave it bubbling untill...

Bit of a re-home should be safer. Positions of the boards worked out, just need to finalise the chassis holes, standoffs, mount everything and rewire.. I hate this, and it's almost like pulling teeth to me due to the tedium.

Slightly distracted.. The PTP components are now strip boarded and the boards have been iso'd. I still need to do a little adjustment to ensure a couple aren't going to get a spark over. Tomorrow I'll anneal the alu sheet so that I can bend it and put in the tube mounting holes. Everything can...

Quick question - could you not use a current mirror to syphon off the leakage current? (at least from the operating point).

So my next adventure will be a simple germanium fuzz face, I love the tone of the red dunlop fuzzface but rather than pay £160 for the official version, I'll DIY it. I've got a potential source for some AC128s so this is an order parts build but a 'keep it as cheap as possible' including some...

So I've gone through and simulated numerous combination and variations of changes. So in the spirit of the recycling only for the competition, I've been going through all the place I can possibly find some resistor values - including the LED/bleed resistors off the some of the old power...

Looking at the control board tuning, I've gone through using the parameter stepping - which allows you to plot multiple runs and see the behaviour throughout the system. With a bias on the control board something interesting happens - we get a low signal input amplification and a high signal...