[1714] Small Signal Transistor Packages

Date: December 29th, 2014 | Comments : none | Categories: DIY.

TO-18 transistor package

I posted photos of several types of small signal transistor packages in the Lab Notebook.


[1696] 1P6T Rotary Switch

Date: December 29th, 2014 | Comments : none | Categories: DIY.

1P6T rotary switch

This is the 6-position rotary switch as sold by Small Bear and other online stompbox parts vendors.


[1691] Stompbox Patents

Date: December 11th, 2014 | Comments : none | Categories: DIY.

I have added the Maestro Fuzztone patent to my page of effects related US patents.

I often see users comment in online fx forums that you cannot patent effects pedal circuits, which is not true, as evidenced by the many patents I have listed on the US patents page.


[1686] Make Your Own Vacuum Tube

Date: December 1st, 2014 | Comments : none | Categories: DIY.

Got any 16 mil tungsten wire laying around?

More info: http://tubecrafter.com/


[1673] PNP Power Transistor Closeup

Date: November 26th, 2014 | Comments : [2] | Categories: DIY.

pnp transistor

This is a PNP power transistor that I have had in storage for years. You can see from the stamp on the metal case top that it was made in the 13th week of 1980.


[1654] Mini vs Mos Distortion

Date: October 17th, 2014 | Comments : [1] | Categories: DIY.

Minibooster-Mosfet distortion graph

I measured the distortion components of a mini-booster and mosfet boost for comparison.

Argggh! The graph above is not accurate. I was connected to the wrong signal generator and was getting results that were too noisy and distorted! The boosters do much better than the previous graphs indicated.

Check out the updated article in the Lab Notebook.


[1645] FV-1 Dev Board

Date: October 8th, 2014 | Comments : none | Categories: DIY.

FV-1 test board

Here is my FV-1 prototype setup.


[1629] Through-Hole J-Fets

Date: July 19th, 2014 | Comments : [1] | Categories: DIY.

BF256 jfet

As previously reported, many through-hole jfets have been discontinued and the prices for old stock has gone up 4x to 10x in recent weeks.



[1598] FCC Part 15 requirements for pedals

Date: July 14th, 2014 | Comments : none | Categories: DIY.

EHX Part 15 compliance

Over EIGHT years ago, I posted a note over at DIYstompboxes about testing requirements for digital devices, including guitar effects pedals. This subject has come to attention more recently as several manufacturers have been fined large sums of money for not complying with the rules.



[1619] EHX B9 Organ Pedal

Date: July 14th, 2014 | Comments : none | Categories: DIY.

EHX B9 pedal

The EHX B9 organ pedal is an excellent sounding box, but not without problems:



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