From: Doug Sutherland (wearable_at_earthlink.net)
Date: 2001-12-13 05:46:46
Since there was a parts list for RS232EEG, I did a summary
and looked up the parts cost at Digikey. These are single
qualtity (<25 peices) costs. The major components are:
1 $2.49 $2.49 7555CN timer
2 $6.82 $13.64 INA114P op-amp
3 $0.81 $2.43 TLC272 op-amp
1 $0.72 $0.72 TL431CLP shunt reg
1 $6.45 $6.45 90S4433-P microcontroller
1 $0.75 $0.75 7805S regulator
1 $3.31 $3.31 MAX232E level converter
2 $0.99 $1.98 6N139 opto couplers
1 $2.78 $2.78 7.3728Mhz crystal oscillator
2 $2.98 $5.96 10k potentiometers
------
$40.51
I didn't want to price out all of the various resistors and
capacitors, but the list is below, along with some other
misc diodes and such. Perhaps there is another $10-$15 worth
of parts? I mentioned in previous post that if 20 of us
order PCB boards from PCBexpress it would be around $40 per
person. So $40 plus the above $40 and say $20 for misc and
we have an EEG for $100. That's not too bad. Beats $1000!
-- Doug
Capacitors
2 1nF
1 10nf
4 22nF
1 47nF
15 100nF
1 22pf
2 27pf,ker
1 0.3µ
4 1µF
2 1µ tant
1 10µ
3 10µ6.3V
2 10µ16V
9 47µF
3 100
5 470
13 1k
2 5k6
1 10k
3 10k 1%
6 15k
1 16.5k 1%
5 100k
4 200k
4 1M
1 1.5M
1 10M
Diodes
9 BAT48
4 LEDs
1 TMA0505S
JP1 PINHD-2X3
L1 20µH
L2 20µH
L3 20µH
NET1 NETCPL
PAD1 U_cal
PAD2 full_scale_cal
PAD3 cal_off
PAD4 Cal_GND
S1 B3F-10XX KEYOMRON ( 5.98 0.65) R0
S2 B3F-10XX KEYOMRON ( 5.98 1.05) R0
S3 B3F-10XX KEYOMRON ( 5.98 1.45) R0
S4 B3F-10XX KEYOMRON ( 5.98 1.85) R0
SV-CH1 MA03-1 CON-LSTB ( 0.85 2.60) R0
SV-CH2 MA03-1 CON-LSTB ( 0.50 0.30) R0
This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:33 BST