MAX232

A switch can be inserted to allow powering from EITHER the serial port OR a 9v battery/mains adapter. Some computers cannot handle the current drain on the serial port and a 9v battery or mains adapter must be used instead. NEVER use both methods at the same time in parallel.

25-Pin D		9-Pin D
20 fnw		4
6 fnw		6
4 rnw		7 /P^
5 fnw		8 /P^
7 rnw		5 /P^
3 rnw		2 /P^
2 fnw		-*ku)— 3 /P^

1N4148

1N4148

78L05

VI

o

z

o

V0

Ali capacitors should be electrolytic capacitors with a value of between 1 uF and 22uF. ALL capacitors should have the same value.

9v Supply

+

16

MAX232

Stereo 2.5mm Pług

■4]

15

14

13

Vcc	C1 +
V+	01-
GND	02+
V-	02-
T1 out	R1 out
R1 in	T1 in