PDP-11/70 Boards

Rob Jarratt robert.jarratt at ntlworld.com
Sun Dec 5 14:28:53 CST 2021

> -----Original Message-----
> From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Jay Jaeger via
> cctalk
> Sent: 05 December 2021 14:51
> To: cctalk at classiccmp.org
> Subject: Re: PDP-11/70 Boards
> On 12/5/2021 3:37 AM, Rob Jarratt via cctalk wrote:
> > Thanks for the tips. The transformer that drives the bricks is a real beast.
> Did you find an alternative more convenient way to power them on the
> bench?
> >
>  From the schematics, some of them seem to want 20-30 VAC (some, like at
> least one of the -15v regulators, take DC inputs from other regulators)
> For lower current initial testing I have some 24v 2A transformers lying
> around.  For higher current, I might use something like this guy:
> https://www.digikey.com/en/products/detail/triad-magnetics/F-
> 401U/5032226

I have a variac rated at 2.5A. I am not quite sure whether that would be sufficient to test the bricks individually. Otherwise, I guess one of these would do the trick https://cpc.farnell.com/block/steu250-48/transformer-250va-230-400v-2-x/dp/TF01418?st=24v%20transformer ?


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