iso variac schematic

1
T3 VAC A F1 F2 L1 T1 T2 M2 M1 S1 2 amp MDL fuse F1 3-prong grounded receptacle X2 R1 SPDT switch S1 Notes: R1 is ½ the resistance of the ammeter movement T3 can be eliminated by changing L1 to a 120VAC capable lamp, such as a neon. 3-prong grounded plug X1 Transformer, 120VAC primary, 6.3 VAC secondary T3 Variable autotransformer (2 Amp minimum) T2 Isolation transformer (2 amp minimum) T1 0-150 VAC voltmeter, output voltage M1 DPDT switch S2 0-1 amp AC ammeter, output power M2 #47 lamp, output indicator L1 1 amp AGC fuse F2 Variable-isolated AC power supply (ISO-Variac) Stan Saeger 02-APR-2007 X1 X2 R1

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Page 1: Iso Variac Schematic

T3

VAC

A

F1

F2

L1

T1

T2

M2

M1

S1

2 amp MDL fuseF1

3-prong grounded receptacleX2

R1

SPDT switchS1

Notes:

R1 is ½ the resistance of the ammeter movement

T3 can be eliminated by changing L1 to a 120VAC capable lamp, such as a neon.

3-prong grounded plugX1

Transformer, 120VAC primary, 6.3 VAC

secondaryT3

Variable autotransformer (2 Amp minimum)T2

Isolation transformer

(2 amp minimum)T1

0-150 VAC voltmeter, output voltageM1

DPDT switchS2

0-1 amp AC ammeter, output powerM2

#47 lamp, output indicatorL1

1 amp AGC fuseF2

Variable-isolated AC power supply (ISO-Variac)

Stan Saeger 02-APR-2007

X1

X2

R1