This is a multi-part message in MIME format. ------=_NextPart_000_0147_01C11D48.D9188C40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit > I was just hoping for a decription of transistors needed This is a typical 5V to V+ high side driver. 5V logic "1" at the base of the NPN turns it on and pulls the base of the PNP low, turning that on also. A signal transistor can be used for the NPN, driving a higher current PNP. Resistor values may need to be changed for your particular application, but probably not. If in doubt, work backwards from the load using the gains of the transistors to determine the base currents required. IIRC this circuit uses BC548 and BC327 ------=_NextPart_000_0147_01C11D48.D9188C40 Content-Type: image/gif; name="hsd.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="hsd.gif" R0lGODlhYQCDAPcAAAAAAP////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////ywAAAAAYQCDAAAI/gADCBxI sKDBgwgTKlzIsKHDhxAjSpxIsaLFixgzatzIUSGAgh87ihQZcmDJkSgzljx5MqVLiCsJtnxJk+HH lQByzqzJE2SAljN1Ch1KtKhRoz1NGtwpsyPTnk8TRp04NenDqhGxWrXpdCtGrVe9XgTrkKzYpV3P UjTLVS3VtG6zwo0bliNbunel0n2rMe9GljkFPvV7kPDXmIJ/IjSMVuxNpYlDsiTpFrHix5DnerV8 MyhltZwvN/5bOfPjnYybgpYZWLFrn333yiUtu6zm2otv4x4de3dblb5tfw0uPKtl4gvvtk5dWmJg 5s2NQ48Oczr1q9ZBH93eGnld495h/lLNflZ59/DJx//UiV6v887kk5pfHx+qRcnt3Y/Nn3s4f9XA 4XYcgL3t1R1qI9UnF2ID0magUkAlWBtOhX32YGQV2jUhhP0ViBdknmnIX3YKWigievGVqJt/+ZH4 n4sjmoiiU+eFZx17Lf4noY4r8liRijb6eKKQLBK5X5AmLVdkcAdyeCRxmL2GmV9AshhTlM61F1qN 4j1Z3GxSipblkr+BeeVr3x2JI31JotmlYEq6uVSDP4Z55nrl4Ucag+zRydNzXd0pppxQcTncnYDi yRdsZZEn2YFTYlmYZxGCZehuSCWmqZTcVTlWVJJKOqeRmRG4mKdMXkpqo4Su2lCcW65WV2qsY9K6 qK2zoYqpqrhOquuEa/b65ae/kvkjr0wOmaODMTK7rIfPBviislpSO6Oz1WJ7LbTZcruttM166xt3 7x0lLK1F3UfUub0Gq26x7MYr77z01utWQAAAOw== ------=_NextPart_000_0147_01C11D48.D9188C40-- -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu