Search found 5096 matches

by mediatechnology
Fri Sep 23, 2022 3:33 pm
Forum: Test, Measurement and Repair
Topic: Tivoli Model One Power Transformer Replacement
Replies: 0
Views: 8

Tivoli Model One Power Transformer Replacement

Tivoli Model One Power Transformer Replacement I have an early Tivoli Model One which recently needed a replacement power transformer. After a recent storm, nearby lightning strike and downed power lines I found the Model One's primary winding open. I love this radio. Turns out the Triad F-114X is ...
by mediatechnology
Tue Sep 20, 2022 4:36 pm
Forum: The Peabody Lounge
Topic: Mouser Electronics: "A Look Inside the Technology and Logistics of our Global Distribution Center"
Replies: 0
Views: 40

Mouser Electronics: "A Look Inside the Technology and Logistics of our Global Distribution Center"

Mouser Electronics: "A Look Inside the Technology and Logistics of our Global Distribution Center" Interesting short video showing Mouser's highly-automated order fulfillment process. https://resources.mouser.com/purchasing-resource-library/mouser-electronics-a-look-inside-the-technology-...
by mediatechnology
Tue Sep 20, 2022 8:09 am
Forum: Build
Topic: Relays for Projects
Replies: 0
Views: 47

Relays for Projects

Omron's deliveries for DPDT relays have stretched out after Panasonic left the market for the DS2Y-series and globalist-engineered supply chain disruptions began . The project BOMs show Omron but there are several options. Here is a Mouser Project Manager list of 12 and 24V DPDT relays. I recommend...
by mediatechnology
Mon Sep 19, 2022 1:56 pm
Forum: Pro Audio Design
Topic: Transfer Console Monitor Controller
Replies: 15
Views: 615

Re: Transfer Console Monitor Controller

I used ULDO-Nacho to check the 1 kHz THD of "Monco" at +20 dBu input. On the Aux output, at +20 dBu it measured just a tad over 0.0001%. (-120 dBc) (1246>5532>1646). The Monitor output, with a slightly longer path and also at +20 dBu, measured 0.00012%. (1246>OPA2134 X2>1646). The measura...
by mediatechnology
Sun Sep 18, 2022 7:03 pm
Forum: Pro Audio Design
Topic: Transfer Console Monitor Controller
Replies: 15
Views: 615

Re: Transfer Console Monitor Controller

I wanted to first check noise level of the Aux Output that can be used to drive an A/D. Measured over a 20-20 kHz bandwidth at unity gain the noise is: -98.5 dBu unweighted providing a DR of 125.5 dB -100.5 dBu A-weighted for a DR of 127.5 dB THD at 1 kHz 0 dBu output was 0.0006% which is near loop...
by mediatechnology
Sat Sep 17, 2022 11:40 am
Forum: Pro Audio Design
Topic: Transfer Console Monitor Controller
Replies: 15
Views: 615

Re: Transfer Console Monitor Controller

I tweaked the threshold voltage for the power OK detector by changing R41 to 11K and R42 to 121K. After adding D11 to quicken turn-off the division ratio was changed by the addition of R42. With the original values Vth was 28V and I thought that was cutting it a little close. Raising R41 and then us...
by mediatechnology
Fri Sep 16, 2022 6:27 pm
Forum: Pro Audio Design
Topic: Transfer Console Monitor Controller
Replies: 15
Views: 615

Re: Transfer Console Monitor Controller

"Monco" runs without any layout errors. It's a really easy build: The hard part was getting everything around the house running after the storm. Once I got to it the build and test went pretty fast. https://ka-electronics.com/images/jpg/Monitor_Controller_Assembled_1000.jpg KA-Electronics...
by mediatechnology
Mon Sep 12, 2022 11:08 am
Forum: Pro Audio Design
Topic: Transfer Console Monitor Controller
Replies: 15
Views: 615

Re: Transfer Console Monitor Controller

Thanks Paul! I'm looking forward to testing it. On Sunday afternoon of the 4th we lost power for about 36 hours after a storm and I'm almost finished repairing damaged electronics. We had hot lines drop onto CATV ground and things went down hill from there. My bench work has involved changing a lot ...
by mediatechnology
Thu Sep 08, 2022 3:24 pm
Forum: Pro Audio Design
Topic: Transfer Console Monitor Controller
Replies: 15
Views: 615

Re: Transfer Console Monitor Controller

Got the boards in today. I'll see if they run.

Image
by mediatechnology
Wed Aug 31, 2022 8:09 pm
Forum: Pro Audio Design
Topic: Transfer Console Monitor Controller
Replies: 15
Views: 615

Monitor Controller Layout

The layout:

Image