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Erik van Tussenbroek email@example.com 2012-02-20 21:30:44.0
Copy of mail to embedded systems
Dear Sir, I have bought an AppleTV-Anschluß für Scart / Euro-AV Order number : 700018 (concerns Auftrags Nr. 211598 vom 02.02.2012) There was no documentation at the package, the only available documentation found was on the internet site of Thomas Schmidt. This link was given on your site under the tab Datenblätter/Downloads http://ts.md-network.de/cocoon/theme2/yprpb2rgb.html. I followed all the instructions to build this board. In the set the following components differ or are missing: - there was no (F1) auto-reset fuse - there was no (R5) 10K 1% resistor - the capacitors C7 and C8 are in the schedule 10 microF, in the set 2x 100 microF - there were 2 resistors of 10k 5% I have bought those components myself to complete the set. But the main problem is that the delivered printed circuit board differs from the available description. In the design of Thomas Schmidt the main power supply was AC current with a stabilized power supply on the board with a simple possibility to change that in an external 5V stabilized power supply. All the components for the on board power supply were delivered with the set except the auto-reset fuse. The difference was not visible because all components on the board were located on exactly the same place (including a wrong connection). I have built the board with stabilized power supply for use with an external AC power supply. When I tested the board with the AC power supply, the power indication led flashed one time. The board was not working. After investigation of the board I discovered that the way of supply was changed from standard AC with a possibility for DC 5V power to standard 5V DC power supply with no possibility to change that in a simple way to AC power supply with the components on the board. In the original design the AC power was connected to (J1) the con-jack, from there it goes to the auto-reset fuse and the rectifier and from there to the stabilizer 7805. In the delivered board there was a position for (all delivered) components for the power supply including the rectifier. But the incoming AC power was directly connected with 5V DC to all components including both ICs and one of the AC connections of the rectifier was directly connected (together with the minus connection) to the ground of the board. This board will never work with the on board power supply! The result of the 9V AC power on the con-jack as mentioned in the original design are a blow up rectifier and both IC on the board. I have no equipment or possibility to replace a surface mounted IC (that is the main reason why I bought this set), otherwise I would have built it myself on a general board. I am now in the possession of a worthless board for 55 euro + the extra bought components, how can this problem solved. With regards, Erik van Tussenbroek (Bachelor of Engineering) Email: firstname.lastname@example.org Phone: ++31628456447
Ton Arends email@example.com 2011-05-15 13:42:32.0
I"m trying to get a YPrPb to RGB converter, but see that your online shop for the PCM board is offline. If you ever read this message, I hope you can give feedback. I would like to build the converter myself, I have some soldering skills, but I have no idea how to get a PCM board for this project.
Fabian Peters firstname.lastname@example.org 2010-11-01 15:42:35.0
Hallo Thomas, melde Dich mal wenn Du magst: email@example.com Viele Grüße, Fabian
Ralf firstname.lastname@example.org 2009-11-26 19:10:51.0
Hallo Thomas. Bin gerade dabei, deinen Converter im Toner-Direkt-Verfahren auf meine Platine zu bringen. Ich bin mit meinem Ausdruck des Layouts nicht zufrieden. Würdest du mir die Layout-Datei für Eagle zukommen lassen? Viele Grüße aus Niedersachsen Ralf