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# #########################################################
# The FIFTH extremely simple circuit diagram.
# Completely Isolated Vertical Amplifier.
#                             +----------------o-----------------------------o----o------+
#                             | +              |                             |    |      |
#                         C1 ===               |                             |LED1| +    |
#                            ---             c o                     Preset. \  --+--    |
#                           __|__               \    b           R3      RV3 /   / \ >>> |
#                           /////             Q1 \|__o---o----/\/\/\----o---|\  '---'    |  
#                  Secondary.   Primary.         /|      |              |    /    |      |
# Tip ----->  O     +------+             R2    |/_       |     I/P   C4 | +  \    \      |
# Ring 1 -->  H     |      | T1 +---o--/\/\/\--o e   C3 ---  +--O)-+   ===   /    /      |
# Ring 2 -->  H  <--+      |    |   |          |        ---  | SK1 |   ---   | R4 \  ZD1 | +
# _Gnd_ --->  H  <--+       )||(    |    C2    |         |   \     |    |    |    /    --+--+
#           +===+   |       )||(    +---| H----o         |   /     |    |    |    \     / \ |
#           |   |   |       )||(           +   |         |   \     +----o----o    /    '---'
#        P1 |   |   | (CT) o)||(               |     RV1 +-->/               |    |      |
#           |   |   |       )||(               |  Variable.  \               |    o      |
#            \ /    |       )||(           TP1 O             /               | S1  /     |
#             H     |       )||(                             |               |    o      |
# Tip.       ~~~    |      |    |                            |               |  + |      |
#  ^                |      |    |                            \               |  __|__    |
#  |   Ring 1.      |      \    |                   Preset.  /               |   ===     |
#  |     ^          |      /    |                    RV2 +--|\               |    |      |
#  |     |    R5    |   R1 \    |                        |   /               | BY1|      |
#  |     +--/\/\/\--o      /    |                        |   \               |  __|__    |
#  |                |      \    |                        |   /               |   ===     |
#  |                |      /    |                        |   |               |  - |      |
#  |       R6       |      |    |                        |   |               |    |      |
#  +-----/\/\/\-----o------+  G O------------------------o---o---------------o----o------+
#                             __|__ Diecast box GROUND.
# Parts List:-                /////
# P1 ......... 3.5mm, 4 pole jack plug.
# T1 ......... Audio Transformer, P/No Farnell 1172421.
#              [OEP (OXFORD ELECTRICAL PRODUCTS) - Z1604 - TRANSFORMER, 1:1, 600/600].
# R1 ......... 2K7, 1/8W, 5% tolerence resistor.
# R2 ......... 680R, 1/8W, 5% tolerence resistor.
# R3 ......... 47K, 1/8W, 5% tolerence resistor.
# R4 ......... 330R, 1/8W, 5% tolerence resistor.
# R5, R6 ..... 33R, 1/8W, 5% tolerence resistor.
# RV1 ........ !M Log, potentiometer.
# RV2 ........ 1K, preset potentiometer.
# RV3 ........ 100K, 10 turn, preset potentiometer.
# C1, C4 ..... 10uF, electrolytic, 16V.
# C2 ......... 3300uF, electrolytic, 6.3V.
# C3 ......... 2.2uF, 50V.
# Q1 ......... BC548B, or any small signal silicon NPN transistor.
# SK1 ........ BNC chassis mounted socket.
# S1 ......... ON/OFF toggle switch.
# LED1 ....... Miniature GREEN LED.
# ZD1 ........ 5.1V Zener diode.
# BY1 ........ PP3 battery.
# PP3 battery connector.
# Diecast box.
# Link terminals, as required.
# Stripboard, (Verobaord), as required.
# Various coloured and tinned copper wire as required.
# Heat shrink sleeving as required.
# Small cable ties, optional.
# Stick on cable clip, optional.
# Crimp ring terminal, for connection to point G.
# Srews, washers, spacers, nuts, grommets, etc as required.
# #########################################################