Hi Scott, The URI PTT open collector output will only sink about 50mA. You will need to boost the output for your application. See http://www.dmkeng.com/images/HIGH_CURRENT_PTT.pdf for a suggestion on how to do this. If you don't need 4 amps you can use a smaller MOSFET. Please contact me if you need any more info about this. David Kramer DMK Engineering Inc. 310-544-1222 -----Original Message----- From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Scott Weis Sent: Monday, January 10, 2011 8:12 PM To: app_rpt-users@ohnosec.org Subject: [App_rpt-users] URI ptt current sink How much current can the PTT on a URI sink. I have a device that draws between 200- 250 ma at 5vdc and don't want to smoke it. Thanks, Scott _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users