Pro Audio Design Forum

Most amazing about DA is the voltage coming back after the cap was shorted.
Coming back after shorts, again and again.
There must be some battery that has built inside, recharging the cap.
Who knows the physics and chemistry that is going on ?

Interesting for a hot place I know in Australia.
What is the heat sink of the heat pump ?
An outside air exchanger I presume.
Can a heat pump give an efficient air conditioning using water from a nearby creek ? At the cost of pumping water, though.

I compared using a differential Deboo integrator, and a non inverting two caps integrator. Integrating capacitor(s) insulation resistor does result in DC offset error in both cases. With the Deboo the resistor mismatch brings a similar effect. With the non inverting two caps, there is no such resist...

There is a catch in the Deboo integrator, differential or single. It is sensitive to resistor mismatch. This can be important or not, depending of the application. When in need for near perfect integrators, one needs capacitors with very high insulation resistors. Using a Deboo configuration, the un...

Some 50 years ago, I had an old washing machine that had gone, clang, clang, clang for years long. I changed the two roller bearings at the drum, then I had a brand new machine. Took about, an hour, the roller bearing shop was nearby. Nowdays, this shop doesn' t exist anymore and we change the machi...

Great. I see it is enabled.
I hope, users will like it.

The "active topics" ( in the quick links, top left ) does not work.
I see it working in another similar site, a very convenient feature.

pigskin goatskin, deerskin and sheepskin. I like goat as it’s very soft. It’s good for tactile feedback but not super durable. Deerskin seems to be the most durable. Pigskin works best in wet weather. Moose skin is exceeding durable, but apparantly a biatch to tan. I have a mooseskin wallet (from F...

At the Integrator ( dual, non inverting ) with OPA2277 I have 30K 10µF for the time constant I need. From the data sheet OPA2277 Vos max is 50µV, Ios and Ibias max is 3nA I am not sure I understand correctly these figures, a bit confusing in the data sheet. With these figures: 3nA x 15K gives a 45µV...

I realize Ios and Ibias can be as important as Vos about the quality of an integrator. The capacitor isolation resistance IR must be hight, easy with film caps, but that is not enough, the capacitor should not leak via the op-amp input pin. The OPA 2277 has a 3nA Ios and Ibias. About this specific p...