The diodes need, according to the datasheet, a minimum of 20 uA to operate. Enric Blanco 4, 5 11 However, at 4V voltage drop, the 10k resistor can only provide 0. However when I measure it, OUT is only 2. When the voltage is less than 5V they can be neglected.
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I changed R2 and R3 to 47k and 22k and all works fine! Post as a guest Name. Andy aka k 10 AltAir 2 You must select a value well below this. That adds up to a minimum of 0. Tony EE rocketscientist 62k 2 21 Besides, from what I understand voltage across anode of D1 and cathode of D2 should be always 5V, right?
Could someone explain me please what am I missing? Those references are not batteries. However when I measure it, OUT is only 2. When the voltage is less than 5V they can be neglected. To achieve the desired result descending resistance R1.
Then the curtain will rise. D2 and D3 cannot magically make 5 volts appear at the junction of R1 and R2 if dataeheet basic voltage at the point is less than 5 volt lmmz D2 and D3 are not present. Home Questions Tags Users Unanswered. Sign up using Facebook. Enric Blanco 4, 5 11 Email Required, but never shown. The circuit operates as a resistive voltage divider. Sign datasheef or log in Sign up using Google. This, of course, ignores your bias current through your LM Select a lower value for R1.
And it is so, if R2 and R3 are not present in the circuit. TOP 10 Related.
LM385: MicroPower Voltage Reference Diodes