Re: [Elecraft] Control Board resistance check values SN7261
Don, Thanks!. Im on to the front panel board. 73 Don -- View this message in context: http://elecraft.365791.n2.nabble.com/Control-Board-resistance-check-values-SN7261-tp7124303p7124702.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Control Board resistance check values SN7261
Don, You should call it "OK" - the emitters are closest to the edge of the board, the collectors are furthermost from the board edge. If you have questions about transistor basing, turn to the Schematic Key page in the back of the manual. 73, Don W3FPR On 12/24/2011 12:05 PM, Don Baucom wrote: > I finished the control board but had the following: > > Q1 , Q2 collector resistance (if the collector is the pin closest to the > edge of the board) both were 3.56K ohms. Manual calls for Above 1 Mega Ohm. > The other non base pins both were infinite on my meter but I think they are > the emitters? > > U6 pin 29 and 30 should each be 70-90K both readings were 97K.. > > What should I do > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Control Board resistance check values SN7261
Whenever circuit resistance values seem low, reverse your DMM leads. Many DMMs produce enough voltage when measuring resistance to begin to turn some of the junctions in the transistors on, making the readings look low. Ron AC7AC -Original Message- I finished the control board but had the following: Q1 , Q2 collector resistance (if the collector is the pin closest to the edge of the board) both were 3.56K ohms. Manual calls for Above 1 Mega Ohm. The other non base pins both were infinite on my meter but I think they are the emitters? U6 pin 29 and 30 should each be 70-90K both readings were 97K.. What should I do 73 K4YND Don __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
