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The dielectric does not cause capacitance - to create capacitance you need to have two conductors. The closer they are to one another the greater the capacitance, the bigger they are the greater the capacitance. Putting an insulator between them increases the capacitance. Ultimately any cable...

If you can get inside the speaker disconnect the mid and treble and listen

Just double check that it is indeed a relay giving the problem, you have a relay for each input, which is at least 6 relays - hard to believe that they would all go defective at once. More importantly the relays are stereo so if a relay does go why is only the right channel disappearing? Get...

If you have a Y connection with 2 series resistors then the crosstalk signal would see one series resistor in series with the other channels output impedance to earth - so a potential divider is formed and if we assume transistors, then the output impedance should be <100R. If a series resistor...

Old speakers tend to be far more efficient than modern speakers - back in the old days there were very few powerful amplifiers available so loudspeaker manufacturers had to aim for sensitivity as well as bandwidth. Nowadays I dont know if you can even buy a new low end 20W amplifier? R600 000...

Although you do make a good point - if you paid a high price for your high end preamp it does seem a bit of a shame to compromise its (hopefully) equally high performance…

Well the goal is 100% crosstalk - a sum of the two channels so yes, the simplest way is to simply connect the two channels together. You will get a 100% mixed signal but… each channel is driven by an amplifier and if they are transistor amplifiers (or opamps) their output impedances are very...

On the contrary it will - passive resistive mixing is the only analogue way to combine two or more signals. Active mixing just adds a virtual earth, which will minimise crosstalk but doesn’t actually change how the mixing is done (via resistors). Take a look at the schematic of any analogue...

The resisters are in series with the signal. Each channel will see the two resistors in series (sum thereof) into the other channel which we can assume is very low impedance (0R) in parallel with the input impedance of the sub. Sub input impedance will be 10k upwards - although 10k is a...

Make cable with 2k2 resistors (470R is a bit low) as per the article

You always want to check you are choosing the courier service of whatever delivery service you are using. DHL tends to be a lot more expensive than other services os I always use UPS or Fedex when I can....

On a mono record the stylus only moves left and right (horizontally) on a stereo record the stylus moves horizontally and vertically at the same time. But on a mono record the stylus inevitably does move up and down due to dust and gunk in the groove. A stereo cartridge will reproduce this up...

I found out the hard way that actually it is the UPS and not the battery. I cannot remember the exact reason - it was online somewhere - but effectively my UPS would not start with a Lithium battery. So you need to check if your UPS will work with your chosen Lithium battery first. The batteries...

If you're using lead-free solder - and you probably should as you are doing repairs and almost all manufactured parts use lead free - just use lead free solder with a small amount of silver in it. The stuff below is a tin/copper/silver mix as an example. Dont spend a fortune on solder if it‘s...

Incandescent light bulb is a resistive piece of wire whose resistance increases with heat. All conductive materials behave this way but lightbulbs filaments are designed to heat up - to get white hot and thus emit light, in use. Wirewound (and other types of) resistors’ resistance will increase...

You need to wait for a load shedding period at night - then use the app or the inverters screen to note percentage of battery at beginning of period and parentage of battery at end of period - or for a 2-3 hours period. Then you calculate percentage used divided by the period's hours and you'll...

New Old Stock - basically old but effectively brand new - with tubes much implied value as the stuff was made in the "good old days"

Dropping your eskom bill means using more of your system’s power than eskom’s. so you want to fiddle with the “time of use” settings. In those you decide how much percentage of battery power you want to use and how much you keep in reserve. During the day assuming sun, the panels will do almost...

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