On this Build Your Own, we cover what an Op Amp Boost is and how to breadboard the circuit. At the end, we cover how to use the Stompbox Electronics Op Amp Boost board for your own boosting needs! What is an Op Amp Boost? Boost circuits are relatively simple, they take in a signal, […]
Build Your Own: Op Amp Boost Circuit for Guitar Read More »
The Problem The EHX Freeze is a fun little box used to sustain notes of a guitar. I’ve modified multitudes of Freeze pedals, probably every version there is. One particular design decision that EHX made during the life-cycle of the Freeze is to get rid of the metal lip around the power connector. So what
Repair Room #21: EHX Freeze Toggle Switch Replacement Read More »
BOSS DD-3 Version History DD-2 to DD-3 (1986) The BOSS DD-3 has it’s origins in a September 1986 service note for the BOSS DD-2. According to Andreas Möller (aka Stinkfoot) the cost of manufacuring the DRAM chips became noticeably cheaper. So much so that BOSS decided to roll out the same DD-2 design at a
History of the BOSS DD-3 Read More »
I received this MXR Analog Chorus on a trade, from which I received 3 other non-working pedals – a Vox V847 Wah Wah, an MXR Carbon Copy, and a Line 6 Constrictor. After plugging in the Analog Chorus I realized it was completely dead – zero output. The LED didn’t even light up when stomping
Repair Room #20: MXR Analog Chorus Repair Read More »
What is a Charge Pump? A charge pump is an integrated circuit (IC) that is used to convert from one voltage to another. As an example, let’s say you want to build a circuit that runs on +18Vdc, but you want to power it using a +9Vdc adapter. You can use a charge pump IC
Circuit 10 of 48: The Voltage Doubler Read More »
What is a Charge Pump Inverter? A charge pump is an integrated circuit (IC) that is used to convert from one voltage to another. As an example, let’s say you want to build a circuit that runs on +18Vdc, but you want to power it using a +9Vdc adapter. You can use a charge pump
Circuit 9 of 48: The Charge Pump Inverter Read More »
Breadboards are used to prototype guitar effect circuits before committing them to copper. It gives you the chance to interact with your creation and really hear the difference between one component over another. In this post, I’ll be covering 5 prototyping boards used specifically for testing out and designing guitar effects circuits. How to Use
Top 5 Breadboards for DIY Guitar Pedals Read More »
This post surrounds the repair of a T-Rex Engineering Hobo Drive afflicted with the dreaded “no signal” symptom. I cover the features of the Hobo Drive and some details about its’ circuit. The T-Rex Engineering Hobo Drive The T-Rex Engineering Hobo Drive is a dual overdrive/booster pedal that features a tight, grainy low-medium overdrive coupled
Repair Room #19: T-Rex Engineering Hobo Drive Repair Read More »
The EHX Small Clone uses a relaxation oscillator-based circuit for its LFO. These are fairly simple circuits that can be modified to include an LED to see the speed of the LFO. The mod involves drilling a hole into the existing enclosure and installing the new LED, along with some wiring changes. Mod Overview This
EHX Small Clone LFO Rate Indicator Modification Read More »
The PT2399 is a digital integrated circuit (IC) that is used in guitar effects to produce echo and delay from 30ms to a max of 340ms.
PT2399 Echo Processor IC Read More »
