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Summary
Photographic Timer
Small inductor in the load is to reduce voltage spikes at switch-on. To Reduce noise use a Gated Zero-Crossing Switch.
Linear PWM
15V supply is regulated. 0.2% linearity over 4 to 12V input. This has been achieved by a constant current source. Current
Mirror.


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Photographic Timer and Linear PWM - NE555 Page 23

Photographic Timer and Linear PWM - Signetics NE555 Page 23


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