[1769] Gearphoria

Date: March 21st, 2015 | Comments : none | Categories: DIY.

Gearphoria magazine

My website was mentioned in the March/April issue of Gearphoria magazine in the Workbench Confidential column by James Lebihan (of Mission Engineering). You can read the article online on the Gearphoria web site. Thanks James!

 

[1766] Fuzz Face Calculator

Date: March 18th, 2015 | Comments : none | Categories: DIY.

Fuzz Face schematic

This calculator is used to determine resistor values for the basic fuzz face circuit to set the desired DC operating point.

Go to the Lab Notebook and try it out.

 

[1761] Big Muff Calculator

Date: March 18th, 2015 | Comments : none | Categories: DIY.

Big Muff schematicThis calculator is used to determine resistor values for the basic shunt feedback transistor circuit to set the proper DC operating point.

Very useful in converting BMP gain stages to use germanium transistors.

Go to the Lab Notebook and try it out.

 

[1755] Calculate Slew Rate

Date: February 20th, 2015 | Comments : none | Categories: DIY.

How Fast Does your Opamp Need to Be?

slew rate of lm308


This calculator is used to find the slew rate needed to reproduce a signal at a specific frequency.

For example, the 0VU level of the -10dBV signal used in most semi-pro equipment is 0.894v p-p. We use this value with the maximum frequency that will be passed through the circuit. Try 20,000 Hz as an example.

The +4dBu signal is 3.47v p-p and you can use the calculator to find out how much faster the amplifier needs to be to push this higher signal level.

The Rat pedal opamp would need to slew about 8.0v at 10kHz. Find the slew rate needed for the opamp.

In the Lab Notebook at http://www.muzique.com/lab/slew.php.

 

[1744] PAM8403 Class D Audio Amplifier

Date: January 24th, 2015 | Comments : [1] | Categories: DIY.

PAM8403 Class D Audio Amplifier

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[1730] AC125 Germanium Transistors

Date: January 22nd, 2015 | Comments : [2] | Categories: DIY.

ac125 transistors

I have a limited number of AC125 PNP germanium transistors available.

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[1727] Delay Time Calculator

Date: January 20th, 2015 | Comments : none | Categories: DIY.

delay pedal

Calculate the number of milliseconds delay to enter into your echo pedal.

 

[1721] Notch Tone Control

Date: January 12th, 2015 | Comments : none | Categories: DIY.

bridged-tee tone control

A bridged-t notch tone control in the Lab Notebook. Enjoy!

 

[1665] Good Band Names

Date: January 11th, 2015 | Comments : [3] | Categories: DIY.

I’ve updated the page of FREE Band Names… check it out if you need a name for your rock-n-roll ensemble!

Good Free Band Names

 

[1740] AC176 Germanium Transistors

Date: January 5th, 2015 | Comments : none | Categories: DIY.

ac125 transistors

I sorted through a bag of AC176 NPN germanium transistors. There were 100 transistors in the sealed bag, and above are the cups with the results of the sorting.

The one on the right is very low gain transistors that are only suitable for use as diodes. The cup in the middle holds transistors with good gain but excessive leakage. On the far left is the cup with the good transistors… there are 2 of them out of the bag of 100. Not good.