[2523] SMT vs. Through Hole

Date: February 27th, 2019 | Comments : none | Categories: DIY.

All resistors have a certain amount of noise when current flows through them. Other factors then add more noise on top of that baseline, such as size, composition and quality of construction. No-name cheap smt resistors will have 200x more distortion than common 1/4w metal film through-hole resistors! Smaller smt resistors have more noise than larger sizes; example 0603 vs. 0805 smt sizes.

Good quality Panasonic or Susumu smt resistors will be better than cheap no-name resistors, and can be close to through-hole devices in performance. Dave Hill of Crane Song shared some real world measurements of resistors which clearly shows that there is a difference in performance between smt types vs through-hole. The diff is small but measurable.


[2514] Isolated 24v from 9v Power Supply

Date: February 10th, 2019 | Comments : none | Categories: DIY.

DC-DC converter to give isolated 24v from a 9v power supply jack. Full article is in the AMZ Lab Notebook.

Edit: I have a few extra pc boards of this project, so if you want one to use for experimentation, I am selling the spares for $5 each plus postage:

Update: I have added information in the article on how to regulate the output down to 18v from the basic 24v design. Enjoy!


[2510] 9v Isolated Power

Date: February 7th, 2019 | Comments : [2] | Categories: DIY.

Details of my 9v isolated power converter now in the Lab Notebook.


[2500] What is a Preamp?

Date: February 1st, 2019 | Comments : [3] | Categories: DIY.

In the last year or so, I have noticed a number of new pedals being introduced that are being called preamps. So what is a preamp, and can a pedal serve as one?

In audio applications, a preamp is a circuit that amplifies very weak audio signals to a level that will drive a power amplifier to its rated capacity.




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