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M0PZT > FT817 27.04.07 01:14l 27 Lines 755 Bytes #999 (0) @ WW
BID : 244_M0PZT
Read: GUEST DL1RX VE7HFY DG4IAK
Subj: Re: Max current from mic 5v pin?
Path: DB0FHN<DB0FOR<DB0MRW<DB0ERF<DB0FBB<DB0IUZ<DB0GOS<ON0AR<GB7SYP<GB7ESX<
GB7ESX
Sent: 070426/2051 @:GB7ESX.#31.GBR.EU $:244_M0PZT Sally 4.1.223 Chelmsford, Ess
Date: Thu, 26 Apr 2007 20:51:01
From: M0PZT@GB7ESX.#31.GBR.EU (Charlie)
To: FT817@WW
Subject: Re: Max current from mic 5v pin?
Andy G0FTD wrote:
> I wanna build a mic preamp into existing mic case, that's why.
The +5v line on the RJ45 mic connector is fed via a 10ohm resistor from Q1088 which is a BA05FP regulator. Appears to
have an absolute max rating of 1amp according to the datasheet.
Source: http://www.datasheets.org.uk/search.php?q=BA05FP&sType=part
If you want the circuit diagrams for the 817, they're on ham.dmz - The following file is 2.8MB:
http://dw.ham.dmz.ro:8080/downloads/yaesu/ham.dmz.ro.sch_ft-817.zip
Happy amplification ;)
--
Charlie - M0PZT @ GB7ESX.#31.GBR.EU
MB7ICF-L 6m+70cm EchoLink Gateway
http://www.m0pzt.com
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