| Title: | AMIGA NOTES |
| Notice: | Join us in the *NEW* conference - HYDRA::AMIGA_V2 |
| Moderator: | HYDRA::MOORE |
| Created: | Sat Apr 26 1986 |
| Last Modified: | Wed Feb 05 1992 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 5378 |
| Total number of notes: | 38326 |
I have successfully built a Midi interface to my AMIGA 500. It works fine
between DMCS and my Yamaha keyboard.
The interface was based on a circuit diagram in an article in the UK
magazine ST/Amiga Format. The total cost was about �7.
If you are interested, press return for the circuit diagram
Nick
+12V+----------------------+--------------+-------------+-------+-------------+
pin9 | | | | |
R R R | |
S 4 6 8 | |
E OUT1 | OUT2 | OUT3 | | |
R *2 | *2 | *2 | | |
I +--------------+-------------+ | | |
A *5 4* | *5 4* | *5 | 4* | | |
L | +----+ | +----+ | | +----+ | |
R R R | | |
3 5 7 | | |
| | | | C+ |
TXD +--R1-+ +--------------+-------------+ | 1 |
pin2 | | | | |
| c | | |
P +-+-+--b TR1 | | |
O | | e | | |
R D+ R | | | |
T 1 2 | | | |
| | | | | |
GND +-+-+---+---+-------------------------------+---------------+ |
pin7 | |
| +----------+-------+-------------------------+----------------------+
S | | | | | |
E | R R | | R
R | 9 1 | IN | THRU 2
I | | 2 | 2* R 2* 0
A | | | | 1 | |
L | | | | *4 5* 7 5* | 4* |
| | | | | | | | | +------+
RXD +-----+ | | | | | R |
pin3 | | | [---8---] | | +-----+ 1 |
| | | [ 2--R14-+ | | R 9 +--+
P | | +--R11--+-+-6 IC1 ] | | 1 | |
O | c | | [ 3------------+ c 8 c |
R |TR2 b-+ | [-5---7-] +---+--b TR3 +---b TR4 |
T | e | | | | | | e e |
| | R | | R R R | | |
| | 1 | | 1 1 1 | | |
| | 0 | | 3 5 6 | | |
| | | | | | | | | | |
+---+--+-------------+---+-------------------+---+----------+----+
| |
+-----------------------+
PARTS LIST
Part Value Part Value - ----+---- -
R1 5K6 R17 3K9 | A junction
R2 1K8 R18 4K7 |
R3 1K R19 1K |
R4 1K R20 1K - --------- -
R5 1K IC1 6N139 | Two wires unconnected
R6 1K TR1 BC547 |
R7 1K TR2 BC547 |
R8 1K TR3 BC547 - ----+
R9 1K TR4 BC547 A wire turns a corner
R10 1K5 D1 1N4148
R11 5K6 C1 10�F 25V
R12 1K5 OUT1 5 pin DIN
R13 1K OUT2 5 pin DIN
R14 220 OUT3 5 pin DIN
R15 12K IN 5 pin DIN
R16 3K9 THRU 5 pin DIN
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 2375.1 | which?????? | VIVIAN::S_GOLDSTEIN | Steve G... DTN: 847-5416 | Mon Mar 20 1989 11:35 | 1 |
Which Issue of ST/Amiga | |||||
| 2375.2 | FORTY2::TATHAM | Nick Tatham @REO | Tue Mar 21 1989 03:20 | 7 | |
> Which Issue of ST/Amiga It was probably Oct-88 or Nov-88 - I borrowed it so can't find out easily - I'll see what I can do. Nick | |||||
| 2375.3 | Need help w/ transistor type | RGB::SCOTT | Wed Sep 12 1990 09:04 | 8 | |
(Belated) Thanks for posting this circuit. One question - could you please give a hint as to what type of transistors are used? I don't recognize the BC number. The info I'm looking for is: NPN or PNP, and approximate gain. Rob | |||||
| 2375.4 | BC547 revealed | FORTY2::TATHAM | Nick Tatham @REO | Thu Sep 13 1990 15:33 | 20 |
My trusty Maplin catalogue lists BC547 as: Case = TO92a Type = NPN V-CEO(max) = 45 V V-CBO(max) = 50 V V-EBO(max) = 6 V Ic(max) = 100 mA P-TOT(max) = 500 mW Typ h-FE = 520 @ Ic = 2 ma Typ f-T = 300 MHz Price = 10 pence h-FE is the gain isn't it? It also says that a BC547 is a BC107 in a plastic case. Hope this helps, Nick | |||||
| 2375.5 | Garden varitey transistor | RGB::SCOTT | Thu Sep 13 1990 15:55 | 5 | |
Thanks much! It looks like a trusty 2N2222 will do just fine.
Rob
| |||||
| 2375.6 | WELSWS::FINNIS | Thu Sep 13 1990 19:53 | 10 | ||
Sorry if the first lead was a bum steer ,
Looks like the old note has been revitalised though !!
Anyone Know of a `cheap' MIDI keyboard
- Pete -
| |||||
| 2375.7 | Casio makes the least expensive MIDI Kbs | RGB::SCOTT | Fri Sep 14 1990 09:32 | 12 | |
> Anyone Know of a `cheap' MIDI keyboard
I have a Casio MT540 - bought a demo unit for $140. A couple of
months back, the MT240 was on sale at numerous places for $120 or so. That's
about the cheapest MIDI keyboard you can get! Damark also has the next
Casio model up from mine on sale for $199. (Just threw away my catalog,
so I don't have the details).
Also check out the DNEAST::COMMUSIC conference for more MIDI info
than you probably want :-)
Rob
| |||||
| 2375.8 | WELSWS::FINNIS | Sun Sep 16 1990 18:36 | 7 | ||
Thanks I'll give that conference a go.
Unfortunately there seems to be little under 100 Pounds in
the Uk..
-Pete-
| |||||