A tiny RS232 adapter using a Max233 (or equivalent) IC. Use for connecting micro controllers to PCs or other terminals.
Tiny Adapter! Only 1.2” X 1.2”
PCB Layout
Eliminates having to place a Max232 or Max233 on every development or production board. One end (DB9) connects to a PC or any other terminal. The other end provides a 4-pin header to connect to any micro controller board that requires serial I/O. The micro controller board provides the adapter with it operating voltage (3.3 to 5 volts*). An LED can be installed to show when power is supplied. Provision is made for a line filtering capacitor, should a long 4 wire connector be used. The Max233 is a dual transciever and has internal capacitors, therefore requiring no external parts. Available as a kit or bare pcb in the BenchParts section.
* With a 3.3v supply the AD233 provides an RS232 voltage swing form -6v to +6v which is sufficient for most RS232 applications. At 5v it provides -10v to +10v.
* With a 3.3v supply the AD233 provides an RS232 voltage swing form -6v to +6v which is sufficient for most RS232 applications. At 5v it provides -10v to +10v.
Bare PCB
Model AD233BK - $20.00
Same as the popular AD233AK except that it includes the CTS/RTS handshake pinouts from the DB9 connector via the Max233. The CTS/RTS pins can be jumpered if handshaking is not required
AD233DK (on left) Similar to the AD233AK except that it has a second I/O port. Designed for microcontroller projects that require two RS232 I/Os. For example one port can be used to collect data from a device such as a GPS and the other port can be connected to a PC terminal to monitor or control the device. Uses a Max233 (or equiv) IC and requires a 3 to 5v dc supply*.
AD233DK complete kit $23.00
PCB layout
AD233DPCB bare printed circuit board
* With a 3.3v supply the AD233 provides an RS232 voltage swing form -6v to +6v which is sufficient for most RS232 applications. At 5v it provides -10v to +10v.
Tiny pcb approx 0.55 x 0.61 inches! Ideal for those projects that require an affordable RS232 I/O port. The kit Includes an SOIC Max232, four 1uf SMD tantalum capacitors, pcb and a DB9F connector. It accepts any TTL RS232 Rx/Tx signals. Requires 5volts DC. This pcb was originally designed for a custom DB9 shell which was a couple of mm larger than most DB9 hoods found in electronic stores. One could most probably make it fit in a standard hood by shaving the corners and edges.
Pcb layout
Max232 pins
5v version uses an IC232 and 1uf caps and the 3v version uses an IC3232 and 0.1uf caps.
The AD232DBH is also available as a 3.3 volt unit. If you would like the 3.3v version please order part number A232DBH3v.
A232DBCT (5v or 3.3v)
New! A232DBCT same as the above but it includes the CTS/RTS lines. Available as a 5v module ( A232DBHCT ) or a 3.3v module (A232DBHCT3V). The modules include a plastic DB9 hood kit. Pinouts on the board are V+,GND,CTS,RTS, TX and RX
A232DBCT (5v ver) - Assembled with /Hood kit $20.00
A232DBCT3V (3.3v ver) - Assembled with /Hood kit $20.00
ST232A 3.3v TTL to RS232 adapter module has a 3.5MM stereo jack which provides three lines, Gnd,Tx and Rx. The board provides jumpers to configure the jack’s Tip and Ring as Tx or Rx. It comes as assembled or as a kit. Will work on 3.3v to 5v.(Email if you would like the 5v-7v version)
RJ45SA 3.3v TTL to RS232 adapter with an RJ45 jack. It provides connections for Tx,Rx,Cts and Rts. The pin connections on the RJ45 are Lantronix compatible. It comes as assembled or as a kit. It will work on 3.3v to 5v. (Email if you would like the 5v-7v version)
Note: This adapter can also be provided as a strip of 2,3 or 4 modules. E-mail if interested.
Pcb layout
A232DTE TTL to RS232 DTE with male DB9 connector
A232DTE 3.3v TTL to RS232 adapter configured as a DTE adapter with a maleDB9 connector. It comes as assembled or as a kit. It will work on 3.3v to 5v.(Email if you would like the 5v-7v version)
