I have finished constructing a balanced microphone preamplifier. The circuit that I used is here: http://sound.westhost.com/project66.htm. The only changes I made were in the choice of transistors (ZTX214 and ZTX300) and the use of switched resistors for setting the gain instead of a potentiometer. When it's set for full gain, it's a little noisy ( Read more... )

Well, it's about electronics and software too, but mainly about cars.

Firstly, there is news about the City-El, my electric bubblecar. I wrote earlier about getting it through the MOT test and running it on a temporary set of batteries. I have now, with a lot of help from aminorjourney, purchased three new Crown 12V 105Ah batteries and installed them. Since ( Read more... )

Yesterday, I received a small parcel containing two SID chips (6581) rescued from doomed Commodore 64s. My plan is to wire one of them up to the Arduino, which I'm currently doing. I'll need a 1MHz Phase2 clock, which means dividing down a 16MHz oscillator module with a 74HC393. Wish the Arduino had a 16MHz clock output pin! Once I have a clock, ( Read more... )

Today, I have been mostly filming The Giant Internet Migratory Box Of Electronic Junk. Well, Phil has been doing the actual video and audio recording, I've been unpacking junk and describing it. That's one for the CV: highly skilled in describing electronic junk. We'll upload the results to a video sharing web-site as soon as Phil has edited it ( Read more... )

I've been getting everything done apart from my Uni work. It's a bit like priority inversion, I suppose. The really high priority, must-do, without-fail stuff just doesn't get done, but all those little niggling jobs that could be done just about anytime get finished off, one after another ( Read more... )