Category: Uncategorized

…with my designed power supply. Although two of them are already working, in the third machine I get a shortcut between analog and digital ground which results in muting the sound. I came up with the idea of a better separation with optocouplers and while a prototype is working the final pcb is not. Really no idea how to continue […]

Happy new year to everyone! A new year and another project to finish – the new power supply. Whilst I have already two machines running with the new power supply I figured out some interferences with the service manual and real life. The service manual does not differentiate between analog- and digital-ground. As a result I have a minor buzzing sound, […]

…and with it finally some time to continue working on improvements for the machine. Am planning another video to show and introduce modifications that should help to increase the sustainability of the machine. I also got another one for spare parts. It got also “modified” with a MP3 player, but, unfortunately, in a way that it cannot be undone. Furthermore, […]

Repairing a CDM2 is like the final boss fight of a 80s arcade shoot’em up for me. There are basically hundreds of things that might fail. Currently I am trying to repair a least one CDM2 for Sanders CD555 because his device failed again. The issues are not easy to fix when not having the official Test-CDs and a special […]

It took a while but finally, the new power supply is finished. Well, already finished a couple of weeks ago but I have been way too busy in my job for any further hobbies. The least, the prototype is running fine without any troubles so I am confident the final release will also work. I just need to find some […]

Have yourself a merry Christmas. I wish you a wonderful time with your beloved. Good news for me is that the new power supply is basically working… more or less. First, I was too motivated to add another microcontroller unit (MCU) to measure the voltages and to trace other ongoing things. As a result, all those components drained too much […]

The parts of electronic that probably fails most often seems to be the power panel. I cannot explain how sick I am of searching for broken parts at this panel. Recently another machine of mine failed to deliver -20V required for the CD-Drive. It takes hours to search through a complicated circuit which also includes other panels to work accordingly. […]

During the last weeks I got confronted with an unusual patient from a colleague. A NAD amplifier where the left channel failed after some hours of playback. Well, I have to admit I hate issues like that, it is easier if something is not working rather than waiting hours for it to fail. Well, and as soon as you want […]

Whilst I was searching for decades for a single CD555 some machines showed up at second hand shops this year. “Relatively” of course, speaking in numbers – the fourth. Two weeks ago a good one showed up at eBay and got sold for about 115€ in UK. Well, not so interesting for Europeans, considering the high transportation costs of 46€ […]

Another idea grow in my mind for a while… the plan to re-develop the faulty uProc board with the microcontrollers of the tape deck and CD-Player. I successfully replaced the tape MCU and added a better error handling and more features but always thought to use the MCU of the CD-Player as it is. However, there are a couple of […]