Keeping amused

[russel]

It gets me to 5 parts (3 if I cheat and say a dual is one part), but yes that is a lovely idea. I will try it now.

Isn't there a part in a dip package that has two matched pnp and two npn? I think it might be a SSM part number?

https://rocelec.widen.net/view/pdf/oyhfpvp7ti/MOTOD205-2-509.pdf?t.download=true&u=5oefqw

Still available for reasonable money as they are not very fashionable.

 

[Arkless Electronics]

https://rocelec.widen.net/view/pdf/oyhfpvp7ti/MOTOD205-2-509.pdf?t.download=true&u=5oefqw

Still available for reasonable money as they are not very fashionable.

web page won't open here....

 

[russel]

web page won't open here....

Works for me mpq6700 Motorola/onsemi or whatever they are calling themselves these days.

https://www.digikey.com/en/products/detail/rochester-electronics-llc/MPQ6700/12118588

 

[Arkless Electronics]

OK it opens in Firefox but not in Chrome here... weird...

 

[Arkless Electronics]

Works for me mpq6700 Motorola/onsemi or whatever they are calling themselves these days.

https://www.digikey.com/en/products/detail/rochester-electronics-llc/MPQ6700/12118588

Useful device there Russel! Good call Only 60p as well

 

[PigletsDad]

PSU intermodulation gives sideboards 100Hz either side of main signal. Simple example is say 1kHz sine wave on the edge of clipping. As supply voltage falls, top of wave clips, but after each mains peak voltage rises and takes stage out of clipping.

Perfectly possible to have little mains breakthrough at 100Hz in a symmetrical design, but much more energy in sideboards. Conventional bridge based THD will underestimate it, but shows up clear in FFT.