[sdiy] OB8 power transformer

[Michael E Caloroso]

Voltage surge from lightning strike?

MC

On Sat, May 25, 2024 at 2:27 PM g m montalbano via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Yes, the one thing I don't want to hear from a customer is "I read it on
> the internet;  you should do ...."
>
> HOWEVER, in this case, the customer was correct.  I finally got the OB8 on
> my bench, and the burnt smell (reminiscent of burnt resistor or opamp) is
> definitely coming from the transformer.  But, checking the transformer with
> a meter & scope reveals that all voltages are present and correct, and the
> transformer is running cool; all regulators are in good shape, and the 5V
> rectifier has been previously replaced with a higher rating.
> The synth is playing perfectly.
> My question is:  what burned on the transformer to create that smell, and
> why is it now working correctly?
>
> On Tue, May 21, 2024 at 2:16 PM Gordonjcp <gordonjcp at gjcp.net> wrote:
>
>> On Tue, May 21, 2024 at 03:26:36PM +0200, Roman Sowa via Synth-diy wrote:
>> > It doesn't necesarily be customer's view, but maybe something another
>> tech
>> > told him before.
>>
>> Which is why we have the plague of HERP DERP MUST REPLACE CAZAPITARS any
>> time people get a faulty (or even just old but not faulty - yet!) piece of
>> equipment.
>>
>> --
>> Gordonjcp
>>
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