Recent content by drew.spriggs

Microcontroller for switching. Really good option if you want noiseless switching and can work with SMD.

Nah, just sounds like you're the sorta guy who thinks telling people what you hate is the basis of a personality. It's not. It just makes you insufferable to interact with. Ps. You know the "Primus sucks" thing is a bit from the band itself...right?

I mean, it's that or I'm somebody who realises that my personal tastes aren't necessarily reflective of reality. Even if you don't like the band, the pedal doesn't even sound bad - there are much worse dirt pedals available for a lot more money than that.

Yes. King Gizz are objectively one of the most talented bands on the planet currently whether you like them or not. $400 isn't even that much for a pedal lol

And we have sound! Had a weird intermittent issue with the original SMPS board I was using, so I swapped it out and it fired up straight away. Two slight issues - at full draw, the power supply drops to about 8.7v which pulls the regulator below the dropout voltage with the thermistor in place...

The normal reason you'd do it would be to use up the spare half of an opamp. Rail splitter would be much easier and use up less room than an opamp, but they are getting a little pricey these days.

Almost there - just need to finish up the OT side of things and fine tune values. Patched out the resistor block to get the current draw on the pre/power amp rails, then did the ol' numbers thing to adjust dropper resistors to end up with 185/180v for the preamp section, and 128v for the power...

Have been waiting for a more elegant solution for an active load, but made this sketchy block of a bunch of 5w resistors sandwiched between some 1/4" aluminium bar. I've set a bunch of mini patch leads up so can be configured in a heap of different ways, and has a 1w shunt resistor at the front...

Well non-update - had the radio back which took up the little spare time I had. New choke had increased the output on one of the lower power bands from about 15 to 50w and there was no longer any obvious sparking, but plate voltage was still only getting to about 1200v. A radio "expert" took a...

Tubes will take up to 2750v and 275mA of plate current - it's actually graphite so designed to glow during use. This is for RF use, but there is an audio version available. In A1 a single triode will make ~3w without grid current, but if you can drive it with enough grid current to get to A2 it...

If they're straight from Daier, they're good - very reputable company

In the middle of closing my business, so been flat out. Did manage to get this bad boy off the bench though - 2400v is scary plate voltage 😅 Wild those tubes will take more grid current than anything else I've worked ons plate current. Recapped, replaced all fasteners, built a new plate choke...

12x7x2". Not socketing them - the footprint is pretty big so if they ever need to be replaced it won't be too bad Found my miter saw was busted, so a circ saw and speed square did the job! No finger joints, but there are some internal braces added that should be strong enough. Still needs a lot...

If you are designing from scratch, there is absolutely no reason to use a 555 these days - it's noisy and shockingly inefficient. Even if you were going to for some crazy reason, the IRF740 is a terrible choice as it's more expensive option than other MOSFET choices that have half the Rds or...

Nothing like some half-assed measurements to drill an enclosure from. Enclosure is a laser cut, CNC bent job from 1.5mm steel I had a friend whip up. If I was doing it again I'd probably use 1mm steel, but this will do the job. It looks like shit, but hammercoat covers all mistakes :ROFLMAO...