Bespav

http://sound.whsites.net/project39.htm

Amb alpha24 Or you can use simple THS4131+LM6171 if your source can work with something like 2-10 kOhm load.

Different kinds of LEDs have different forward voltage requirements. Non-bright LEDs tend to require less voltage than bright LEDs, since bright LEDs need more power to work. Typical VLED values are 1.7V for non-high-brightness red, 1.9V for high-brightness high-efficiency low-current red, 2V for orange and yellow, 2.1V for green, and 3.4 to 3.6V for bright white and most blue types.

I'm taking my own here: http://m.ebay.com/sch/i.html?sid=jianxulia0&_pgn=1&isRefine=true Matching of 4 quads: Gate capacitance of N-type: Gate capacitance of P-type: They are similar to 170/74 pair, but a little more noisy, 1/2 in gate capacitance, 2/3 in transconductance and P-type are rated up to 40 V.

Ground loop, imho. Or badly designed feedback. Or bad IPS/VAS supply. Or some kind of combination.

Small brother - balanced Dynalo can be routed like this:

Hi, everybody! I'm novice here and signup being impressed mister Kevin Gilmore designs. First of all - thanks to him for making designs opened! Now i'm thinking about building Dynahi at a different manner than author. The main concept is to put overall amp in a comparatively small case such 3209: http://m.ebay.co.uk/itm/3209-class-A-Full-Aluminum-amplifier-Enclosure-AMP-case-both-side-heatsink-/271986781371?nav=SEARCH So, PCBs must be rerouted. Here i want to offer another building idea, best to understand by photo and renders (for understanding dimensions - caps are 18 mm diameter and 35 mm height): There are several benefits in such layout. 1. Input stage (further - IPS) and voltage amplification stage (further - VAS) are separated from output stage (further - OPS). 1.1 So we can easily swap IPS/VAS board based on BJT/JFET, balanced SuSy or single-ended, SMD or throughole without need to demounting OPS from heatsink. 1.2 Each of the board are comparatively small and can be done with better shielding/decoupling, and even on a 4-layer PCB if needed at a low price. 1.3 Further improvement via changing small IPS/VAS board at a reasonable price. I suppose, that OPS board can be splitted to two boards under 100x100 mm and prototyped here at a very reasonable price: http://www.pcbway.com/pcb_prototype/ This thread will contain all PCB gerbers/projects or custom numbers at PCB-providers. Any opinions/suggestions?