Regarding=20 https://www.circuitlab.com/circuit/6tvuuw/verstarker-und-signalmischer-tele= fonlautsprecher-und/ Is the low voltage after some milliseconds a simulation error? If not=20 where does it stem from? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .