Search results

Bit of a re-home should be safer. Positions of the boards worked out, just need to finalise the chassis holes, standoffs, mount everything and rewire.. I hate this, and it's almost like pulling teeth to me due to the tedium.

Slightly distracted.. The PTP components are now strip boarded and the boards have been iso'd. I still need to do a little adjustment to ensure a couple aren't going to get a spark over. Tomorrow I'll anneal the alu sheet so that I can bend it and put in the tube mounting holes. Everything can...

Quick question - could you not use a current mirror to syphon off the leakage current? (at least from the operating point).

So my next adventure will be a simple germanium fuzz face, I love the tone of the red dunlop fuzzface but rather than pay £160 for the official version, I'll DIY it. I've got a potential source for some AC128s so this is an order parts build but a 'keep it as cheap as possible' including some...

So I've gone through and simulated numerous combination and variations of changes. So in the spirit of the recycling only for the competition, I've been going through all the place I can possibly find some resistor values - including the LED/bleed resistors off the some of the old power...

Looking at the control board tuning, I've gone through using the parameter stepping - which allows you to plot multiple runs and see the behaviour throughout the system. With a bias on the control board something interesting happens - we get a low signal input amplification and a high signal...

So following on from the first initial stage post. I've updated the ltspice model and added some additional variable parameters. This approach allows me to see roughly how everything will behave. You'll note the use of {parametername} in some of the resistances, capacitances and voltages...

So we can break the tuning down to the constituent parts of the compressor: 1. The variable first stage - how the signal changes over changing bias and how do we tailor the stage accordingly. 2. The gain stage - this will be a constant gain, thus all we need todo is tailor to not distort and...

Ohh I like that enclosure art - very goth/doom!

Indeed: vi.

Here in the UK, a competitor price of a Peterson is £120 (mini), £130ish (larger HD). Given we pay tax on shipping costs, that means 20% VAT covers both shipping and component price, it's going to put quite a pressure on the total DIY kit cost. $149+$39 = $188.00 which is £139, then add 20%...

Agreed - the number of manufacturers that are producing THT is dropping and even the size of SMD is dropping. I even bought a magnifying glass/light anglepoise thing for soldering SMD! Oddly SMD isn't as bad as you think for soldering. The pain is when the device has a large pad for thermal...

All my internet purchases go through PayPal, in fact I can't think of the last time I entered my card details anywhere other than a major payment provider. (I used to work in quantum encryption so I've heard all the chilling stories and it's only going to get worse with AI 'vibe coding')...

Sounds like it's got large ground plane that's sucking the heat out. I'd love a solder station but for now I'm stuck with an old 25W Antex and an old inherited 85W iron for those PITA jobs. Solder I use MG chemicals SAC305 32-gauge that's unleaded that works for most things at which point I...

Minor update from last night. I've fabricated a bypass 'foot switch' that allows a pair of recycled relays to switch between direct and tube-compressor output. It even has an LED! This allows the A/B testing with the amp and the guitar which is nifty and doesn't increase the length of the...

When it's finally finished uploading: Behold! Now I'm going to get some lunch because I can't think straight with zero blood sugar.

Initial testing with the signal generator is a pain to sweep amplitude. I'm having to use AM modulation in a ramp of the signal: A bit hacky but it shows 0Vpp to 3Vpp where you can see the 1khz wave output (yellow) drop from the input (purple). I need todo some more tuning. What I'd love todo...

So I've worked out what's happening. 1. There is no oscillation. I've soldered in fuses between each stage and put a MOV over the primary. What I believe was happening Is that the unconnected 12V toroidal on switch off was causing a voltage spike on the primary as the flux collapsed causing the...

A cascode is a great way to increase gain, but it has lousy PSRR and a high output impedance. Often you’ll see a cascode followed by a cathode follower. This means you get increased gain and then a driver to stop the next stage/pedal from seeing a high impedance. Furthermore, you’ll want a...

I think the regulator is working! So that's measured output from the tube compressor itself and not just the regulator. Looking at the scope I'm seeing -65dB at around 649KHz.. but the audible range is stone cold. It would improve further with some additional shielding.. So this is ready for...