Update: Kits available in the shop here. I finally got round to revisiting the manual JFET matcher project. Please take a look at the earlier article and refresh yourself on the details of the three tests we can perform to help match JFETs: Vgs(off) – which we approach with a gate-source resistance of 10M Ohms… Read More »
I’ve been looking at using an encoder as a front panel control. Encoders are industry standard devices made by ALPS, Panasonic, Bourns and CTS among others. They come with and without a push-button switch and (not-counting the switch) have three terminals, labelled A, B and C. We can connect the C terminal to +Vcc or… Read More »
I thought I would make myself a crib sheet for the basics of designing with op amps. Then I thought I may as well post it here so I won’t have to remember where I put my crib sheet. This will be an ongoing thing. The subject is: Analogue audio design using op-amps with single-ended… Read More »
Update – extra schematics and timing diagrams added (see below). Also TLP222G photo mosfets are available in the shop here. There has been discussion on Stompville here (in the comment section) and on diystompboxes.com about problems with audio clicks when using a relay for true bypass. The consensus seems to be that the answer is… Read More »
Here are a couple of options for generating proper 48V phantom power from a 9V supply. Before we get stuck into the details I should point out that the quiescent current for the first option is about 27mA and for the second about 52mA, so don’t be thinking you can run this from a PP3/1604/6LR61… Read More »
Update: reStomp re-ampers now available for sale in the shop. I had an enquiry about re-amping and decided to look into the idea more closely. Traditionally, when recording a guitar (particularly an electric guitar), it is usual to experiment with the combination of guitar, pickups, effects and amplifier to get the required sound and record… Read More »
Both my valve (tube) amps have a power switch and a standby switch. When I first got a valve amp, I didn’t know why it had two power switches and I kind of assumed that the standby function was just a convenience to keep the amp warmed up without having it fully on. Recently, however… Read More »
UPDATE 8th May 2012: I have now posted a library for the AXE133Y on the Arduino website I bought the AXE133Y from the Picaxe store. It’s an inexpensive and easy to assemble kit which gives you a serial-controlled 16 x 2 dot-matrix OLED display. I wanted to connect it to an Arduino UNO using SoftwareSerial… Read More »
Update: Remote controlling the True Bypass here. Update: SMD version here. Update: True Bypass Relay with muting here. Update: True Bypass kits are available to buy in the shop here. I have used Arduino over the last twelve months or so for a couple of projects and I have been looking for an excuse to… Read More »
I’ve had some interest in and feedback for my Altoids Piezo DI box and I have revised the design sufficiently to warrant a new post. The new design has the following changes from the previous version: 1/4″ jacks on input and output Low-voltage monitor (TC54) on the battery supply Higher voltage zener (33V) Increase R7… Read More »