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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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3rd Feb 2023, 4:55 pm | #61 |
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Re: Identifying unknown items
Thread reopened by request.
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3rd Feb 2023, 5:46 pm | #62 |
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Re: Identifying unknown items
This switch looks as though it could be from some telephony equipment, though I can't think where it would be mounted...?
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3rd Feb 2023, 5:58 pm | #63 | |
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Re: Identifying unknown items
Quote:
https://worldradiohistory.com/Archiv...nd-1974-06.pdf Appears to be some sort of thingie for syncing a sound recorder to a camera? It's a mystery wrapped in an enigma. |
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3rd Feb 2023, 8:41 pm | #64 | |
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Re: Identifying unknown items
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3rd Feb 2023, 9:03 pm | #65 | |
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Re: Identifying unknown items
Quote:
During office hours there were always at least 4 or 5 in the office or the yard. All the regional offices had a similar arrangement. In the case of the Avonmouth office the switch was in the corner of the window sill adjacent to the fault controllers desk. Cheers Mike T
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4th Jul 2023, 10:04 am | #66 |
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Re: Identifying unknown items
This is a mount for the familiar Colvern 1½" WW pot (in this case 500R), and has a screw clamp for the skirt of the knob, though the screw is self-tapping into the Bakelite mount, so cannot have been intended for frequent use. Two of the four mounting holes have spire clips for the self-tapping screws.
A printed sticker on the side is marked 76500 T while the designation 402669-A is moulded on the rear Anyone recognise this?
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18th Sep 2023, 1:19 pm | #67 |
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Re: Identifying unknown items
Two bare PCBs which seem to make a pair, marked "FOC"
Seems to take 2 terminal pins/wires and a few components, maybe a speaker crossover network?
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18th Sep 2023, 1:37 pm | #68 |
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Re: Identifying unknown items
Circuit board B seems to have positions for two transistors.
Could it be a buffer circuit? |
18th Sep 2023, 2:18 pm | #69 |
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Re: Identifying unknown items
Ah yes, and it's got a '+' terminal
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20th Sep 2023, 12:41 pm | #70 |
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Re: Identifying unknown items
Looks more like FCR than FOC!
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21st Sep 2023, 2:24 pm | #71 |
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Re: Identifying unknown items
Ah, yes, think I was going to offer them FOC
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21st Sep 2023, 5:48 pm | #72 | ||
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Re: Identifying unknown items
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22nd Sep 2023, 10:41 am | #73 | ||
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Re: Identifying unknown items
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13th Feb 2024, 10:56 pm | #74 |
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Re: Identifying unknown items
Does anyone recognise this slow motion dial? The face is decorated with panelled fields of star patterns and is meant to screw to a fascia. It takes a ¼" round shaft. Both sides of the anodised circular dial are marked 0 to 100 and can be seen through three windows, the top one having perspex 'glazing'.
The outstanding feature is that the slow-motion knob can be tilted upwards to disconnect it from the dial plate allowing direct turning, and then re-engaged without shifting the new position.
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1st Mar 2024, 1:38 am | #75 |
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Re: Identifying unknown items
Here's a twin gang pot ganged also with a variable capacitor. The pot at the knob end is very approximately 6k Ohms logarithmic. Behind that is very approximately 9k Ohms linear. At the rear is variable capacitor with thin paxolin as the dielectric, covering 25pF - 560pF with all the variation taking place within a rotation of about 60 degrees. There are no manufacturer idents or other markings.
What could it be? I can only think of combined Volume, Gain, and Feedback for a TRF.
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1st Mar 2024, 5:19 am | #76 |
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Re: Identifying unknown items
Hi Jules, yes I saw a single pot and cap version of those many years ago on an early 30's set as a vol/gain control.
Can't remember which set though Ed |
16th Mar 2024, 10:13 pm | #77 |
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Re: Identifying unknown items
Small PCB found in a box of stuff, no idea where it came from, but it has had the 2nd most valuable pair of components removed. The 1st most valuable is a pair of TA7358AP "FM Front End" ASICs but these are still in position. What were removed appear to be ceramic resonators serving as the LO for some frequency conversion process.
Although intended for FM Broadcast receivers in the range 83 - 108MHz there are no bandpass functions in the IC and they could be used down to audio, and at first I thought the board might be an audio device, but tracing out the circuit finds several tuned circuits using EPCOS RFCs. Simple calculation of resonant frequencies looks like the external I-P is around 1.7MHz and the O-P is around 10.7MHz, from which I conclude that the missing resonators were 9MHz. Was the TA7358AP used in CB SSB rigs? What else could possibly require up-conversion from 1.7 - 10.7MHz?
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21st Mar 2024, 12:05 pm | #78 | |
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Re: Identifying unknown items
Quote:
Nope, they look very similar but the microphone connectors have a third connection for screen/shielding. Cheers, Scott.
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21st Mar 2024, 12:06 pm | #79 | |
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Re: Identifying unknown items
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Cheers, Scott
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