Circuit Guide

 

RTFM - IC datasheets are in the filing cabinet, circuit diagrams are scattered in notebooks

 

Probe Circuit

 

Emitter Circuit

 

Fast Bias Drop Circuit

 

How it works

 

  • Input signal closes relay
  • HV power supply charges capacitors
  • Input signal to relay removed, relay opened, HV supply can be removed
  • Emitter retracted, position sensor sends pulses to One Shot circuit
  • t_d later, One Shot circuit outputs signal to HV MOSFET circuit
  • signal goes through ISO amp, op amp amplifies signal
  • signal goes to MOSFET, allows current to flow to quickly change emitter bias

 

Other Stuff

  • "Pause" one shot blocks new pulses for 1 second after first pulse
  • "Length" one shot stops stignal to HV MOSFET circuit after 1 second
  • Timing of one shots can be changed by changing potentiometer resistance
  • 35.4 kOhm corresponds to t_d=21.6 ms, should vary proportionally
  • Voltage divider allows voltage measurement
  • OPA606 in white circuit takes +16V, -4V

 

Connections

Box      

Banana

 Power from transformer for relay op amp +12V, GND  

BNC

 Input from retracting emitter position sensor +5V, GND red,green
BNC Input to open or close HV relay +5V, GND  red,none
BNC Output from voltage measurement -10V, GND red,green
Banana HV connection to 2 uF capacitors  -1000V, GND purple,green
SHV Input from HV power supply to charge capacitors -1000V  purple
Banana Ground  GND  green
Banana Output to emitter bias  -1000V  purple
White Cicuit
      
M/F round Various wires to relay op amp    red,black,green
F, round Input from BNC on box to open or close relay  +5V  red
F, flat Power from batteries for OPA606 +16V,-4V,HV GND red,black,purple
9V clips Power from batteries for ISO122 +-9V, HV GND red,black,green
F, round Power from yellow circuit for ISO122 +-12V, GND red,black,green
F, round Input from one shots to ISO122 +4V, GND red,green from brown,green
F, round HV connections to yellow circuit and capacitor -1000V purple
F, round Ground connections to box and capacitor input GND green
F, round Input from power supply SHV on box to relay -1000V purple
Yellow Circuit      
F, round HV connections to white circuit, emitter bias output -1000V purple
F, round Output from pause one shot to nowhere +4V ground
F, round

Leads for resistor common and different potentiometers

   white,red
F, round Input from retracting emitter BNC on box to one shots +5V,GND brown,green from red,green
M, round Output from one shots to ISO122 +4V,GND brown,green to red,green
F, flat Power from battery for one shots +4V,GND white,green
F, round Output from voltage measurement to BNC on box -10V, GND red,green to red,green
F, flat Power from batteries for OPA606 +-12V,GND red,black,green
M, round Power to white circuit +-12V,GND red,black,green

 


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