Silicon and germanium transistors (often marked with Q1, Q2 etc, in schematics) 3LQRXWV&ROOHFWRU &%DVH %(PLWWHU ( 131 1

3133

&ROOHFWRU& &ROOHFWRU %DVH%  %DVH 

(PLWWHU( (PLWWHU

JFET transistors (N-channel) 3LQRXWV'UDLQ '*DWH *6RXUFH 6

*DWH 

'UDLQ

6RXUFH

MOSFET transistor (n-channel) *DWH'UDLQ

         

6RXUFH

:KDWWKH\ORRNOLNH  JHUPDQLXPJH JHUPDQLXPZLWKKHDWVLQN³ROGHU´VLOLFRQPHWDOFDQ  

  ³PRGHUQ´VLOLFRQPRVIHWMIHW            7KLVLVWKHSLQRXWKRZ\RX³UHDG´WKHP        

7UDQVLVWRUV%LSRODU6LOLFRQ "A", "B" or "C" digit at the end means; "A" = low gain, "B" = medium gain, "C" = high gain ([DPSOH%&% %&131metal can)

%&131metal can) %&131

036$131'DUOLQJWRQNPN 036$ NPN 

1NPN (metal can) 1NPN  1NPN 1NPN

1NPN  1PNP  1NPN 1PNP 1NPN 1PNP

1PNP 

1 NPN  1 NPN  1NPN 1PNP

1'DUOLQJWRQNPN

1'DUOLQJWRQNPN 







E

B

C

E

B

C

B

C

E

C

B

E

C

B

E

E

B

C

B

C

E

B

C

E

E

B

C

C

B

E

C C C C

B B B B

E E E E

C

B

E

C C

B B

E E

C E

B B

E C

E

B

C

B

C

E

B

C

E

7UDQVLVWRUV)(7VDQG026)(7V "A", "B" or "C" digit at the end means; "A" = low gain, "B" = medium gain, "C" = high gain ([DPSOH%)$ %))(7  %))(7  %6026)(7 -)(7 03))(7  1)(7  1)(7  13FKDQQHO)(7 1)(7  1)(7  1)(7

D D S G G G G

G S G S S S S

S G D D D D D

G G D D

D S S G

S D G S