TKANSISTOKS AM) .lUNCTION DIODKS 



55o 



similar to that in Fi.u;. 18, except that an adchtioiial sta<>;(' oi' cunciit 

 anij)h{i('atioii has been added to the basic push-pull ciicuit. 



Briefly, the reiiulating action is as follows. (1) 'I'he currents /i and 

 7u r(\spoud in push-pull I'ashion to changes in output \-oltage VI as 

 covei-ed in Section 3. 31), (2) currents /i and h are amplified by the 2-watt 

 n-p-n transistors {T^) and (7^4), (3) the amplified currents (I3) and (74) 

 flow in control windings (Ci) and (C2) of the magnetic amplifier to con- 

 trol the voltage absorbed by the power winding (LI), (4) this action 

 regulates the average value of the voltage rectified by the germanium 

 diode (Dl), thus completing the feedback loop. Tests show that this 

 circuit is capable of ±1 per cent accuracy of the output voltage with a 

 zbl5 per cent change in the line voltage and with load current variations 

 of from 10 to 100 per cent of rated output current. 



4.32. 60 -Volt, 200-Am'pere Germanium Rectifier 



Fig. 22 is a circuit sketch of a 65-volt, 200-ampere regulated rectifier 

 suitable for charging and floating central office storage batteries. This 

 rectifier employs six of the power rectifying cells with forced air cooling 



FILTER 



REGULATING 

 REACTORS 



TO 3 PHASE 

 60 CYCLE LINE 



HIGH-LEVEL LOW-LEVEL 



(2 WATTS) (50 MILLIWATTS) 



Fig. 22 

 rectifier. 



Si.xty-five voH two-hundred amjjore nuigiietic amplifier regulat(!d 



