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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!feeds.phibee-telecom.net!news.mixmin.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Don Y Newsgroups: sci.electronics.design Subject: Re: Power from another source fed to 1117 regulator output pin Date: Mon, 30 Sep 2024 05:21:28 -0700 Organization: A noiseless patient Spider Lines: 11 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Mon, 30 Sep 2024 14:21:31 +0200 (CEST) Injection-Info: dont-email.me; posting-host="e26c28db990f411086565032b28e36d0"; logging-data="2357097"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18ODtg9J8KNhDzDycPJKAev" User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.2.2 Cancel-Lock: sha1:mQw5rLvkjBypGHjACjmCeZ3wkv8= In-Reply-To: Content-Language: en-US Bytes: 1654 On 9/30/2024 4:37 AM, Pimpom wrote: > I've been looking at the schematic of a popular product that has two options as > the power source. One source is a Vin point (pin or DC jack) that goes to a > 1117-5V regulator, the other is a USB port. The USB +5V line joins the 1117 > output via a Schottky diode. > > Does this mean that the 1117 has no problem with this arrangement - that is, > with power coming from another source to its output pin? Short the LDO's input to GND and consider how it will (mis)behave.