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RED_GREEN_LEVEL_DISPLAY

2016-12-17 18:17  
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RED_GREEN_LEVEL_DISPLAY
Level detector can be used with TTL, DTL, and RTL, as probe for troubleshooting. Indicator is Monsanto MV5491 dual red/green LED, with 220 ohms in upper lead to +5 V supply and 100 ohms in lower +5V lead because red and green LEDs in parallel back-to-back have different voltage re quirements. Will furnish green indication on high or plus signal and red indication on low or false signal. Supply voltage of +5 V can be taken from equipment under test. Circuit requires SN75451 driver ICs and two sections of SN7404 hex invelter.-K. Powell, Novel Indicator Circult, Ham Radio, April 1977, p 60-63.