A more versatile Overdrive pedal

There are lots of overdrive pedals in the world, but most of them follow the same formula, an operational amplifier circuit with negative feedback, 3 knobs that control gain, volume and tone, one type of signal clipping , no bass ajustment and sometimes aren’t true bypass.

Ohms Law Calculator

Enter two known values and press Solve to calculate unknowns.
Volts (Volts)	Resistance (Ohms)	Current (Amps)	Power (Watts)

Dual isolated guitar power supply

Pedal power suplies are simple circuits, yet sold at high prices, that provide DC current to turn on guitar effects. A good one needs to be quiet or humless, provide stable 9 volts and with multiple isolated outputs. In this example I use a center tapped transformer to create 2 isolated outputs.

Plate Dissipation

Power Amplifier Class Class A / Single Ended Class AB / Push Pull
Select a tube 5751 12AX7/ECC83 12AT7/ECC81 12AU7/ECC82 12AY7/6072 ECC88/6922 ECC99 6N6P 6N1P 6N2P 6SN7 6SL7 6V6 6P6S 5881 6AQ5/6P1P/EL90 6L6 6L6GC KT66 KT77 KT88 EL84 6P14P 6550 EL34
Number of Tubes/Triodes 1 2 4

Plate pin voltage:		volts
Cathode pin voltage:		volts
Cathode resistor:		ohms

Results
Max Plate Dissipation:		watts
Your Plate Dissipation:		watts
Your Plate Current:		miliamps

Zound Zkulptor Booster

Any guitar player, who wants to be heard loud and clear, and to sometimes overdrive a single channel amplifier needs a boost pedal. A boost pedal is a stomp box with a circuit inside that increases the strength of guitar´s pickup output, making it sound much louder. This project is my version of guitar booster using single MOSFET transistor.

The Royal Albert Hall Box

The Theremin

I always wanted a theremin like the one Jimmy Page had. With a dozen components, KiCAD and DIY, I finally got mine.