Print This Post Print This Post

Pimping an Op-Amp for wide voltage swings

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 [...]

  • Share/Bookmark
Print This Post Print This Post

SMD Resistor kit storage – a headache solved with a 4-a-day Pill Planner for 99 pence?

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 [...]

  • Share/Bookmark
Print This Post Print This Post

LEMS – A Leslie Speaker Emulation System

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 [...]

  • Share/Bookmark
Print This Post Print This Post

Ultra-easy use of 64-pin TQFP PIC Microcontrollers using TQFP-to-DIP PCB from VOTI

VOTI TQFP-to-DIL Header with PIC and ICSP fitted

A while ago I purchased a batch of 18F6620 TQFP PIC Microcontrollers at a ridiculously low price. The barrier to use of TQFP packages is, of course mounting these SMD packages effectively alongside the ‘normal’ components enthusiasts tend to use. At the time I set about and [...]

  • Share/Bookmark
Print This Post Print This Post

3-Channel Radio Microphone Mixer

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 [...]

  • Share/Bookmark
Print This Post Print This Post

Modular CamCorder Audio Mixer

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 [...]

  • Share/Bookmark
Print This Post Print This Post

The Pequeno – An Arduino me-too-alike for PIC Microcontrollers

How to use the large variety of Arduino ’shields’ on the PIC Microcontroller.

pequeno (portuguese) adj. small, little, minor, slender. (amongst others)

Apologies in advance for the mixed bag this post has turned into, covering as it does the Pequeno board, a 28-pin SOIC header, Arduino prototype board and 2-wire LCD board, not to mention the source-code! [...]

  • Share/Bookmark
Print This Post Print This Post

Versatile SOIC PIC Programming Header

A small PCB allows for the out-of-circuit programming of 18 & 28 pin SOIC PIC Microcontrollers from either an ICSP programmer or ZIF socket.

Completed unit showing SOIC package guides made with wire bridges

A recent article in a popular electronics magazine presented a small printed circuit board for programming 18-pin SOIC PICs from a ZIF [...]

  • Share/Bookmark
Print This Post Print This Post

No-Frills 6-Input Stereo Line Mixer

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 [...]

  • Share/Bookmark