Since tests with FT232-chips have been successfull and my pcb copper etching machine now is ready for mass production, here is a complete new revision of the ICD. The description is a little bit preliminary, you must apologize that I didn't have had much time for this at the moment. So please see the guestbook/forum, too!

I used SMD parts, thus the PCB size is only 5cm x 5cm. It features an USB interface (FTDI FT232BM) and is complete bus powered. Vpp is obtained through a easy-to-use monolitic 5V to 15V DC-DC-converter (in Germany: e.g. Reichelt, 8EUR). The generation of the TARGET_PGM signal has been simplified. It is now generated by an OpAmp and a poti, so you can adjust Vpp to your desire (and no need for lots of discrete transistors confusing the people especially when using replacements...). The PCB is only single sided (easy for "hobbycicians" to do...), but you can use the second side as complete gnd, then you won't need 3 wires. Type 1206 resistors and capacitors are used. You will have to add 3 wire connections and 3 connections to the gnd side (see air wires at pictures below (dark yellow)). The FT232BM appears as a virtual COM-port when installed, so don't select USB but the FT232's COMx-Port at MPLAB!

The picture above shows the new ICD getting firmware flashed by the old style ICD. I think the main advantage is that you don't need a heavy external power supply. Perhaps it might be speeded up as PL mentioned in the forum. Here are the schematics and the PCB. But be aware of a design fault concerning the pinning of the USB connector and the test pin of the FT232(tie it to ground!!)!!! In both cases, see the FTDI datasheet!!! I will try to correct this as soon as possible.

See the guestbook/forum!