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Q&A

Posts tagged power-supply

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81%
+7 −0
Q&A Technique to reset pulse transformer core quickly

I am analysing a pulse transformer which is required to transfer below communication protocol pulse from primary to the secondary side. The pulse duration is 32 μs and off time available to reset t...

2 answers  ·  posted 3mo ago by kadamrohan16‭  ·  last activity 3mo ago by Andy aka‭

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+0 −1
Q&A SMPS Requirements [closed]

I want 3 SMPS (AC-DC) : Vout/Iout - 5V/20A , 12V/75A , 24V/30A Vin (AC) ~ 220V/50Hz I want it such that I can use Hard &amp; Soft Kill Switches for turning off. Can you help me with the same. I tho...

0 answers  ·  posted 9mo ago by Sye‭  ·  closed 9mo ago by Olin Lathrop‭

75%
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Q&A PNP Darlington pair as a current limiter

I am trying to analyse what is controlling the load current in the below Darlington configuration. Is it the base current of transistor Q3 which is controlling current through R14 / emitter curr...

1 answer  ·  posted 10mo ago by kadamrohan16‭  ·  last activity 10mo ago by Olin Lathrop‭

81%
+7 −0
Q&A Low-frequency PWM-controlled Mosfet heater circuit

The circuit above is used to control a 240W ceramic heater by means of a PWM signal at 30Hz, generated by a microcontroller, with 5V logic. The input is a standard 280W AC-DC external power adapt...

2 answers  ·  posted 1y ago by francesco‭  ·  last activity 1y ago by Pete W‭

71%
+3 −0
Q&A Design considerations for a synchronous DC/DC converter

In the field of DC/DC conversion, one can build a synchronous DC/DC converter (also referred to as synchronous rectification). This practice involves replacing a diode with a MOSFET switch. As far...

2 answers  ·  posted 1y ago by Mu3‭  ·  last activity 1y ago by Olin Lathrop‭

83%
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Q&A Why 3V3 instead of 3V?

Usual values used in doing electronics/power supplies are almost always round numbers: 5V 12V 28V 48V 60V I understand that in some cases IC's are built to accept the voltage directly com...

2 answers  ·  posted 2y ago by 2kind‭  ·  last activity 1y ago by Mu3‭

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+1 −0
Q&A Humming noise from a boost converter's inductor

My step-up converter makes audible noise both with and without a load.I am almost certain it is the inductor, because when I hold my finger on it I can feel vibration and it gets quieter. Unfortuna...

2 answers  ·  posted 2y ago by Kranulis‭  ·  last activity 2y ago by Olin Lathrop‭

Question power-supply
71%
+3 −0
Q&A Replacement power supply voltage and current ratings?

If the external power supply to a device fails, and I can't get the exact model, what do I need to specify to get the right replacement? I can re-use the old supply's connector, but what about the...

1 answer  ·  posted 2y ago by Olin Lathrop‭  ·  last activity 2y ago by Olin Lathrop‭

Question power-supply