[BC] Providing schematics

[Dana Puopolo]

Well, I live in Los Angeles, and they ain't supplying it!

-D

------ Original Message ------
Received: Thu, 04 Oct 2007 02:47:08 PM EDT
From: "Wayne Woollard" <woollard at inreach.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Subject: Re: [BC] Providing schematics

If you are in the state of California, the law requires it be supplied upon 
request. A portion of the Fair Repairman Act.  According to the law you have 
the right to repair something you bought and paid for.

Wayne Woollard
----- Original Message ----- 
From: "Dana Puopolo" <dpuopolo at usa.net>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Thursday, October 04, 2007 10:52 AM
Subject: [BC] Providing schematics


I have been using Broadcast Tools products for a long time and find them 
well
made problem solvers. As part of the Greenstone closing I wound up with a
couple of their devices; specifically a SS 4.1 relay switcher and an AHR-1
headphone station. I've been looking to obtain an audio control preamp for
some time (for now I feed all audio through my Sony Trinitron CRT TV set-a
compormise at best), but being unemployed makes purchasing one-even used-
impossible.  So, I began looking at these two pieces as a way to make a 
decent
preamp. Turns out that the AHR-1 uses three dual opamps and has its own
onboard three terminal regulators. Since I also have a 24 volt AC wall wart, 
I
thought about running a pair or diodes as half wave rectifiers and two caps 
to
make =/- 18 volts. I'd pick the audio off just after the volume control and
that way have the benefit of a headphone amp to boot. The unit has balanced
inputs, which would work great with the SS4.1 as a source selector. The 
opamp
chips in the unit are commercial grade, but I obtained some samples of
National Semiconductor's new esoteric (and expensive!) super grade hifi dual
op amps. Seems like a good way to make an audiophile grade premap for
practically no $$!

Broadcast Tools doesn't provide a schematic of the unit, just a "functional
diagram" which basically shows hook up instructions, so I emailed them to 
get
one. They refused to provide one to me! In fact, apparently they don't 
provide
ANY schematics of ANY products to ANYONE!

I have a REAL problem with this! Am I justified? Shouldn't broadcast 
equipment
manufacturers provide schematics of their equipment so station engineers can
repair the equipment THEY own? I know that most DO provide schematics. Is
Broadcast Tools in the wrong here or am I simply being too anal over this?

Comments?

-D


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_______________________________________________

The BROADCAST [BC] list is sponsored by SystemsStore On-Line Sales
Cable-Connectors-Blocks-Racks-Test Gear-Tools-Lots More + Now Barix too!
www.SystemsStore.com       Tel: 407-656-3719    Sales at SystemsStore.com