Budget

STM Budget

Item	Vendor	Price/EURO	Price/US$
Mechanics
Piezo tube scanner	Sensor Technology	74	82
Brass for STM head	Koch und Krupitzer	36	40
Machining of STM head	Peter Eggerstedt	256	286
Fine-pitch screws and nuts	New Focus	83	93
Import duties for screws	UPS	22	24
Stepper motor	Conrad	2	2
Electronics
DSP evaluation board (Motorola DSP56002 EVM)	Elektronikladen Detmold	175	195
Power supply components	Simons	56	63
2 cases for electronics	Simons	36	40
6 Op-amps OPA445 (40V)	Schuricht	46	51
1 A/D converter MAX195	Maxim	0	0
2 D/A converters MAX542	Maxim	0	0
Low-bias op-amp OPA124	RS	10	11
diverse electronic components	RS, Simons	72	80
Software
Shareware “AudioTester”	Ulrich Müller	26	30
LabView student edition	Addison Wesley	56	63
Consumables
HOPG samples	Scanning Probes Inc	54	60
Tip wire (PtIr)	Scanning Probes Inc	31	35
Total		1035	1155

Notes

Please note that all parts were bought around 1998, so prices will probably have changed. Prices in EURO are what I paid, including sales tax, shipping and import duties, if applicable. (Well, actually they are converted from Deutsche Mark prices, which was our currency back then.) The US$ prices are for orientation only; they are merely the EURO prices multiplied by 1.12 - the approximate exchange rate at the time of purchase.

The mechanics turned out to cause a substantial part of the cost. You can probably get away much cheaper with a more improvised setup (which I did not dare, since I found the expected mechanical stability most difficult to judge). Better yet - enlist someone with a lathe and mill in the project…

I obtained free samples of the Maxim A/D and D/A converters. The MAX195 would have been about EUR 45 (US$ 50) in single quantities; I don’t know about the MAX542, but would guess another EUR 45 for two of them.