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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: John R Walliker <jrwalliker@gmail.com> Newsgroups: sci.electronics.design Subject: Re: Cooling a TO-220 7812 regulator Date: Thu, 19 Sep 2024 19:40:26 +0100 Organization: A noiseless patient Spider Lines: 24 Message-ID: <vchr6q$fglq$1@dont-email.me> References: <5xzFO.64422$lZG8.30677@fx09.ams1> <vc9qtl$2vngs$1@dont-email.me> <8vsgej9j96i96di7k065q0avop21i28o77@4ax.com> <64kGO.73253$lZG8.16832@fx09.ams1> <QgkGO.60108$Xx4a.21046@fx11.ams1> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Thu, 19 Sep 2024 20:40:27 +0200 (CEST) Injection-Info: dont-email.me; posting-host="bd5109298ff71309c57205e303d57c31"; logging-data="508602"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/ryweSVFB/63oOceS2pUYhdhgoPFOxoJ4=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:wpAvLHzg6qUbsHyxEwqNSciQSM8= Content-Language: en-GB In-Reply-To: <QgkGO.60108$Xx4a.21046@fx11.ams1> Bytes: 2053 On 17/09/2024 19:55, Pimpom wrote: > On 18-09-2024 12:12 am, Pimpom wrote: >> On 16-09-2024 11:40 pm, john larkin wrote: > >>> >>> I agree about the standup vibration issue. Why not use a surface-mount >>> dpak? >>> >> I considered using the D2pak version but decided against it. One >> reason is that I live in one of the most remote regions of a third >> world and we have nothing like Digikey here. So I've made it a habit >> to use only the most easily available parts. The D2PAK version of 78xx >> isn't in that category. > > Forgot to mention that I've decided to place the 7812 on the copper side > and bolt it directly to the PCB. Changed the layout to accommodate the > reversed pin orientation. Once you have bolted it down you might as well flow solder between the heat sink tab and the pcb. This will give you the best possible thermal contact. John