[2579] Pickup Simulation

Date: May 16th, 2019 | Comments : none | Categories: DIY.

A popular article on my web site is the one about pickup simulation, and questions come up several times every year about the transformers recommended for this project. One technique that works well is to get a cheap guitar pickup and use it as the input inductor.

The black wire of the pickup goes to the input jack while the red wire connects to the input of the electronic circuit. If there is also a braided shield, it can be connected to ground. The 10k trimmer and the 330pF capacitor are simulating the cable connecting the guitar to the pedal.

Cheap pickups are readily available for $5 or $6 on Ebay, or from US suppliers of parts for cigar box guitars (cbg). The 3-pole pickups for the cbg projects will be physically smaller and there are even versions with a metal shield over the coil.

The pickup has the electrical characteristics of a guitar pickup (because it is one), and in this circuit it works quite well to modify the tone and response of a fuzz circuit or other project.


[2566] Inside Ge Transistors

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



[2562] Power Testing

Date: May 8th, 2019 | Comments : none | Categories: DIY.

This is a small test board that I made for my own use. It goes between a power source and a pedal being tested. The objective is to provide access to the voltage source terminals. A battery or unregulated power supply will often have voltage sag when loaded, so this lets me measure the actual voltage with the pedal connected without having to remove the back of the box.

The power jack was mounted on the back of the pcb to make sure that it is out of the way of the probes, but now that I have assembled it, that placement seems unnecessary.

There is not only easy access to the actual voltage being used, but also the yellow jumper block can be removed and a meter placed across the two pins so that a measurement of the current draw can be easily made.



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