Posts by wakibaki

Quote: Originally Posted by kenman345  400 hours   What makes you think 400 hours will be enough?   w

Quote: Originally Posted by shake  Would heatsinking really be necessary if it's being biased in the same way pimetas are biased?  These JFETs are only pulling a few mA.   Maybe no, but maybe yes. You...

I redesigned and relaid the main board for this.     I built up a second one, one channel had 10mV of DC offset    There's no reason other than an unfortunate combination of parts, but I re-did the...

Home etched solder stencil for this build:-     My first try at toner transfer, couldn't get the UV polymer to work. Obviously there have been a few pinholes, but the copper is thick enough that they don't go thru...

  Quote: Originally Posted by shake  Would it be safe to do with with a class A headphone amp or would it produce too much heat?     Probably best to organize it with a heatsink and arrange...

The pots came, but in the end I decided to go with this 10k Alps one from RS http://uk.rs-online.com/web/p/trimmers-potentiometer-rheostat/2499159/   I can get it in 1k in the same footprint from Farnell, but it's out of stock...

Tracking regulator idea...     I can't claim credit for the basic idea, I was talking about tracking regulators with a friend, he sent me a schematic he found for a fixed voltage one with a 7805. I modified it to...

I found a few redundant components, made the output relay run off the on/off switch. This should mean that the relay opens before the capacitance in the rest of the circuit discharges, hopefully preventing any switch-off...

I used iron plated tips on Weller irons, OEM parts. They last about 18 months of everyday use with regular multicore lead/tin eutectic, which is better than a brass or copper bit, but they don't survive forever. I'm talking...

Some distortion info & alternate configurations here:- http://silonex.com/audiohm/levelcontrol.html   They also recommend controlling them with current sources rather than voltage. I saw somebody doing that on...