A wide-voltage swing op-amp for less than £1.00?
As promised in an earlier post, I describe here my experience in turning a common-or-garden TL081 PDIP op-amp into a wide-voltage swinging monster, with a minimal sprinkling of SMD and a small circuit board made from scraps.
Prototype 72 volt op-amp
I wanted to augment my current heavy-duty power-supply [...]
The last few kits of SMD resistors I’ve bought off eBay have arrived as short cuttings from bandoliers, with each resistor nestling safely in it’s tiny little cardboard nest. Although care is needed when extracting a resistor for use, these are easy to store in cheap multi-compartment drawers.
However, the last lot I ordered from Hong [...]
Updated: 16th July 2011 @ 3:02am
This post describes the design and construction of a Leslie Speaker Emulation System (LEMS) control unit, based around an 18F26K20 PIC Microcontroller. The unit is intended to be used to split an audio signal into 3 phases, amplitude modulate these and feed to a Leslie Speaker Emulation driver unit [...]
A while ago I put together a portable 3-channel mixer suitable for using 3 wireless receiver-connected microphones. I had posted photos of the mocked-up unit on my photo gallery for the intended user, then subsequently posted photos taken during development and construction. I also posted photos showing mods to a cheap (illegal in UK) Microphone [...]
A set of modules to build a CamCorder Audio Mixer, or other general purpose use.
I have a CamCorder. Not the latest flash-memory whizz-bang, but a venerable, though entirely reliable, Panasonic VDR-M55EB with CD-Ram. It’s great for out and about shooting, reliable and easy to use, and when I needed to rehearse the making of a [...]
Updated 14th December 2010
(A companion article detailing a 6-output Line Distribution Amplifier can be found here: http://www.joebrown.org.uk/wp/?p=5283 )
I wanted a small (physically) mixer to accept line signals that was both simple and low-cost, for use as both an input expander for PC Soundcard input and also for general use in recording. Looking around the web [...]