AE EP#44 Simple Electronic Dummy Load

Several years ago Dave Jones posted a vid about a very simple current sink and I wasn’t too successful replicating it then on prototyping board and went on to make one a little different. lately I wanted to go back and do it properly this time to test the mini-psu’s and the sources on my broken Tektronix 2236. I think it became a neat little build and plan to expand on it putting it into the multi module case with some atmega and 7-segment displays. Here is the vid:

A zip file containing everything is here: DC_load

The rendering of the Design…
board_render_cut
…and the real version:
IMG_5671

whoop whoop

AE EP#40 Not Quite An Insulation Transformer

So I put the old insulation transformers case to retirement and put it into this new space-saving case to fit my bench perfectly besides the old Heathkit VTVM. I can just repeat my warning: THIS IS NOT legally an insulation transformer! I do NOT use it to be able to touch its output, I only use it as a current limiter on newly built circuits. So enough for the legal crap, enjoy the video:

AE EP#39 Sequencial Motor Controller Prototype

Finally it seems I made something actually useful 😀 This board is to control my fathers vinegar machine.
I provides him with an easy to use interface to set a sequence of up to 4 motors to control vinegar and air pumps. But be warned, this is a prototype – not the final design. For now the buttons’ response is hell and save/load/reset functions are not implemented. It is based on an atmega168 from avr but I think the final version could go down to an atmega88 (~5k flash in use now). Enjoy the video:


Here is my first draft >>>WARNING this is NOT the board, just my first idea!!!<<< the concepts are there, all pinouts can be derived from the software. There will be a nice schematic in v1.0! sequenzer
The software:
seqmot0.1

Have fun!

C1-94 BNC Adapter

So my Tek 2236 grew some problems in the Display control section. Luckily I stumbled across a Russian C1-.94 (speak S1-94) with some DIN-5 Plug for input. I asked the guys on Fingers’ Forum for help and voilà some parts out of the grab box and my adapter is ready:

Here I still ha a little GND connection problem, fixed now (the C1-94 is floating atm, I’ll replace the old calble asap)

Thanks again shpank, Henning and Reutron!

AE EP#34 Heathkit IG-102 RF-Signal Generator

Hi Folks,
After more than a month of video-making abstinence I finally managed to make another one.
It’s about the classic Heathkit IG-102 signal generator. 2 Tubes, the 12AT7 and the 6AN8 make up 4 oscillators (3x RF, 1x internal modulation). Some little hack at the end…

if you need some manuals I probably can help you. I can’t put up any manuals ’cause Heathkit was a little cranky about that sort of thing – so until the situation is clear, just ask.