[68] Sweet Sound Electronics

Date: January 31st, 2008 | Comments : [2] | Categories: pedals.

Sweet Sound effects pedals

Bob Sweet, maker of the Mojo Vibe, Ultra Vibe and other excellent pedals, has been diagnosed with cancer. He has a tumor that is malignant and will need to be removed and treated with chemotherapy, and radiation. Bob does not have medical insurance and the treatments that he requires will be very expensive and have already taxed Bob and his wife financially.

I ask that you donate what you can to help our friend, so please send a Paypal contribution to his email address at b0bsweet@bellsouth.net. Every little bit helps with Bob’s medical bills as he continues his treatments.

I am sure that many of us have had family members and friends that have battled this disease.

Musictoyz has established a Bob Sweet Charity page for information and updates.

My contribution has been sent. Please help if you can. Many thanks in advance!



[67] Mini-Booster Build Report

Date: January 25th, 2008 | Comments : [6] | Categories: DIY.

Mini-Booster custom stompbox

Check out this terrific looking mini-booster pedal by Andy C., built using one of the AMZ pc boards.

He generously posted a complete build report on the DIYstompbox forum. Check it out for more pix and full text about his project.

Great job, Andy!



[66] True Bypass Misinformation

Date: January 21st, 2008 | Comments : [15] | Categories: Uncategorized.

true bypass switch

I’ve seen a lot of misinformation written about true bypass switching, and little of it is confirmed by the actual measurements that I have made on the currently available switches and multiple pedal setups.


[65] Bandpass EQ Filter

Date: January 9th, 2008 | Comments : [4] | Categories: DIY.

gyrator circuitsAn LC filter is useful in forming a bandpass EQ, and often a gyrator circuit is used in place of the inductor to reduce costs and save space.

Gyrator bandpass filters are found in tone controls or as frequency shapers in “metal” pedals.

I have programmed a calculator to make it easy to find the center of the passband of the filter.

It can be accessed from the AMZ Lab Notebook or by this direct link.

Can you find the gyrator filters in this pedal?


[64] Voltage Doubler PCB

Date: January 1st, 2008 | Comments : [11] | Categories: DIY, power.

Charge pump voltage doubler




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