Woody Pro - under the bonnet

Not hard to see Woody Pro. is constructed of base components. Base components form modules which are then interconnected to form the whole buffer/driver. The output caps made from 20 X 10uf polypropylene caps (20 in all) can be easily seen with the aluminium and tar rapped PS to the left. A two stage filter is used comprising of 2 X 10,000uf Nichicon electrolytic caps per channel (total 40,000uf) which are snubbed. The single 2N3055 per channel bolted to the timber is on the far left. All of this in a 1U 19"case. The case is fully earthed and fused and the ferrite chokes use used to filter RFI\EMI.

All internal wiring is via pure silver wire and all internal power connections are via medium gauge OFC speaker wire. A 4oz solid brass knob tops off the attenuator\volume control. Woody Pro. is sleek and very quiet partly due to UF4003 Ultra-fact diodes (which are all individually snubbed) and encapsulated twin toroids. Wood Pro. is dual mono construction. The frequency response is below 10Hz to over 135Khz. Harmonic distortion is extremely low.

Woody Pro.

I had built two head phone drivers (HPs) for my low impedance Grado and Audio-technica head phones. I also discovered they were very good line buffer\drivers due to their low output impedance and high input impedance. They are named Woody and Woody Pro. due to the fact the the single transistor per channel is bolted hard to a block of Asian timber.

In Woody Pro. dual encapsulated mini-toroid transformers drive ultra-fast diodes and 40,000uf of filtering plus resistive ripple reduction to produce two very clean supplies. Twenty 10uf polypropylene capacitors are paralleled to produce 2 X 100uf output caps. There are two selectable inputs. The first input and output have both RCA and 6.5mm phone jacks connected.

Each channel has one 2N3055 in an emitter follower configuration. The sound is immediate, clean, with good bass extension bass and fast. Because Woody Pro. is an emitter follower 10% of the input signal is lost. This has never been a problem with most sources deliver around 2V.