- DL manuals
- Oakley
- Stereo System
- 3U
- User Manual
Oakley 3U User Manual
Summary of 3U
Page 1
Oakley sound systems 3u oakley modular series overdrive soft and hard clipping module user manual and builder's guide v1.1.3 tony allgood b.Eng oakley sound systems carlisle united kingdom.
Page 2
Introduction this is the user manual and builder's guide for the issue 1 overdrive 3u module from oakley sound. This document contains a basic summary of its operation, a how it works section, a full parts list for the components needed to populate the board and some basic testing methods. For gener...
Page 3
The 3u overdrive module this is a simple but very effective waveform modifier module. It has two basic modes selected by a switch. Hard clipping is a hard edged distortion type effect useful for grunging up your signal. Soft clipping is a more subtle effect and produces a clean sounding overdriven a...
Page 4
Using the oakley overdrive – a personal perspective. Since this module has been available i have read many comments from users regarding its usefulness. Probably more than any other oakley module it has produced the largest split of people who either loved, and still love it, and those that were pro...
Page 5
However, it can be also used more subtly on more mellow filter sweeps with the overdrive adding gentle overtones to a solo synthesiser lead. The actual input level is very important too. The overdrive module will produce much more strident results when the input level approaches 5v peak. If the inpu...
Page 6
The overdrive pcb the pcb has double sided copper traces and features though hole plating. The finish is pb- free and the board is made from glass fibre for strength. The size of the board is 71mm (deep) and 83mm (high). I have provided space for the three main control pots on the pcb. If you use th...
Page 7
Components for general information regarding where to get parts and suggested part numbers please see our useful parts guide at the project webpage or http://www.Oakleysound.Com/parts.Pdf. Some special considerations for this project the op amps are any high quality dual audio op-amp. The design has...
Page 8
3u overdrive parts list the components are grouped into values, the order of the component names is of no particular consequence. A quick note on european part descriptions. R is shorthand for ohm. K is shorthand for kilo- ohm. For capacitors: 1uf = 1000nf. To prevent loss of the small ‘.’as the dec...
Page 9
Onboard pots all pots alpha 16mm 47k lin or 50k lin balance 100k log gain 10k lin timbre the timbre and balance pots have space to mount pot brackets. Note that when fitting the gain pot, which has no pot bracket, a shim washer should be fitted between the pot and the inside of the front panel. You ...
Page 10
Circuit description this module is probably one of the simplest we make, and indeed, if you have already looked at other overdrive circuits you may well recognise some of the features used in this particular design. The module is powered in the conventional way from a split rail of +/-15v. This come...
Page 11
Signal is simply limited to a set maximum or minimum voltage. The ts circuit is more subtle than that. The gain of the op-amp non-inverting amplifier is set by the resistances within the feedback loop, but because of the way it works this is always more than or equal to one, ie.0db. That is, the out...
Page 12
The tone control is based around the classic ts and sd-1 design and is built around u3b. Its a simple circuit that works well in practice and produces enough tonal variation to be very useful. At the lowest setting of the tone pot, called 'timbre' on the suggested front panel, c1 acts in conjunction...
Page 13
Connections this 3u module comes with two power supply possibilities. 1. Power connection pwr is the standard oakley 4-way 0.156” mta socket. Friction lock types are recommended. This system is backward compatible with motm and blacet systems. Power pin number +15v 1 module gnd 2 earth/panel metal 3...
Page 14
Use multistrand hook up wire to connect each socket lug to the relevant pin on the header. Keep your wires short but not too short and you can use as many different colour wires as you can – although i tend to use one colour because i'm a minimalist. There is absolutely no need to use screened cable...
Page 15
Testing, testing, 1, 2, 3... Apply power to the unit making sure you are applying the power correctly. Check that no device is running hot. Any sign of smoke or strange smells turn off the power immediately and recheck the polarity of the power supply, and the direction of the ics in their sockets a...
Page 16
Final comments if you have any problems with the module, an excellent source of support is the oakley sound forum at muffwiggler.Com. Paul darlow and i are on this group, as well as many other users and builders of oakley modules. If you can't get your project to work, then oakley sound systems are ...