UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Components and Circuits

Notices

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.

Closed Thread
 
Thread Tools
Old 26th Apr 2018, 10:50 am   #1
Brian of Romsey
Triode
 
Join Date: Jul 2017
Location: Fairfield, Melbourne, Australia
Posts: 48
Default Pin-out for SEI Quartz Oscillator

Hi,

I realise this might be a bit off-topic, but I'm hoping that this is the right audience.

I have recently acquired an SEI brand quartz oscillator about which I'm hoping to get some information on the pin-out and the supply voltage. It is labelled as follows (with the bold text hand written onto the label):
SEI QUARTZ OSCILLATOR
QC. 1260
PART No.
FREQUENCY 94.808 MHz

SERIAL No. 721559
MADE IN ENGLAND
The case is 1.4" by 1.0", and about 0.4" thick. On the bottom there are four pins in a rectangle 1.0" by 0.5". One of the pins is clearly ground and is directly connected to the case, the other three are isolated. Below is a poor diagram showing the layout:

Code:
------------------
|  A          B  |
|                |
|  G          C  |
------------------
With G being the ground pin and A, B, & C being the other three. Pins G, B, & C show signs of having been soldered to in the past, pin A looks clean in this respect.

So, any suggestions about pin-out or supply voltage? I'm guessing that it will be a 5 Volt part with a full swing on the output, maybe TTL-like.

Thanks in Advance, Brian.
Brian of Romsey is offline  
Old 26th Apr 2018, 2:18 pm   #2
barrymagrec
Octode
 
Join Date: Dec 2017
Location: Morden, Surrey, UK.
Posts: 1,552
Default Re: Pin-out for SEI Quartz Oscillator

Frequency is a bit high for TTL I would have thought, more likely a sine wave or just possibly ECL in which case be careful as the supply may be -5.2 volts.
barrymagrec is offline  
Old 26th Apr 2018, 3:37 pm   #3
ronbryan
Octode
 
Join Date: Jan 2003
Location: Guildford, Surrey, UK.
Posts: 1,958
Default Re: Pin-out for SEI Quartz Oscillator

If one of the pins appears isolated from the ground pin, when checked with a low voltage resistance test, it is probably the AC coupled sinewave output pin. The package may also have a second, square-wave output, as is the case with a 10MHz CQXL SPXO I have here.

Ron
ronbryan is online now  
Old 26th Apr 2018, 4:27 pm   #4
G6Tanuki
Dekatron
 
G6Tanuki's Avatar
 
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
Default Re: Pin-out for SEI Quartz Oscillator

These were reported-on in April 1969 in Wireless World (see Americanradiohistory website).
Attached Thumbnails
Click image for larger version

Name:	Screenshot - 260418 - 16:25:19.png
Views:	172
Size:	145.4 KB
ID:	161864  
G6Tanuki is offline  
Old 27th Apr 2018, 8:54 am   #5
davidw
Heptode
 
davidw's Avatar
 
Join Date: Sep 2006
Location: Woodbridge, Suffolk, UK.
Posts: 641
Default Re: Pin-out for SEI Quartz Oscillator

The only data I can find is this for these Cathodeon packages.
Attached Thumbnails
Click image for larger version

Name:	Cathodeon.jpg
Views:	267
Size:	42.9 KB
ID:	161882  
__________________
Dave G1AGK.
My perception is my reality!
davidw is offline  
Old 27th Apr 2018, 10:22 am   #6
Brian of Romsey
Triode
 
Join Date: Jul 2017
Location: Fairfield, Melbourne, Australia
Posts: 48
Default Re: Pin-out for SEI Quartz Oscillator

Hi G6Tanuki,

That's very helpful, thanks. Now I know it's operational parameters, I can go on guess at the pin out - there's only two possibilities after all. I'll start with +9 Volts on the pin diagonally opposite ground and look for the output as I wind the voltage up (watching the current).

Cheers, Brian.
Brian of Romsey is offline  
Old 27th Apr 2018, 10:29 am   #7
Brian of Romsey
Triode
 
Join Date: Jul 2017
Location: Fairfield, Melbourne, Australia
Posts: 48
Default Re: Pin-out for SEI Quartz Oscillator

Dave,

Thanks for the Cathodeon info. Such a variety of pin-outs! Nothing like to standardisation of today.

Cheers, Brian.
Brian of Romsey is offline  
Old 12th Jul 2018, 10:20 pm   #8
Brian of Romsey
Triode
 
Join Date: Jul 2017
Location: Fairfield, Melbourne, Australia
Posts: 48
Default Re: Pin-out for SEI Quartz Oscillator

Hi,

I finally got round to testing and sorting this oscillator. It does work (which is always a worry for second hand stuff from a radio rally).

At 9.0 Volts it draws between 3 mA and 8 mA on the pin diagonally opposite the ground pin. The output is a sinewave, centred on ground, with an amplitude of 2.9 Volts peak-to-peak when loaded only with the 'scope and 1.8 Volts peak-to-peak when loaded with 50 Ohms.

The pin-out, viewed from above (like normal chips are):


+------------------------+
| 4 = Ground ... Out = 3 |
| 1 = N/C .. 9 Volts = 2 |
+------------------------+


Strangely my bench PSU seemed unable to deliver a solid supply, loads of ripple - 840 mVolts! Even with a 47 nF polyester & a 470 pF polystyrene right across the pins the ripple only got down to 530 mVolts. Ah well, the output looked like a clean sinewave no matter what.

Cheers, Brian.
Brian of Romsey is offline  
Old 12th Jul 2018, 10:52 pm   #9
Radio Wrangler
Moderator
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,798
Default Re: Pin-out for SEI Quartz Oscillator

Don't assume 9v just because some cathodeon oscillators were. They were competitors and each produced a very wide range of options. 12v was common, so were 6v and 8v.

Check pin 1 for diode + series resistor to ground. it may be a voltage operated frequency trim (also optional)

It's about 35 years since I last saw Dave Standring and the quartz folk at Times Mill. They were good people and they made very good stuff.

David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is online now  
Old 14th Jul 2018, 4:31 pm   #10
Brian of Romsey
Triode
 
Join Date: Jul 2017
Location: Fairfield, Melbourne, Australia
Posts: 48
Default Re: Pin-out for SEI Quartz Oscillator

David,

I used 9 Volts because of what I read from the press release in post #4. I did actually start powering it up with 5 Volts and, because it drew only a few milliAmps, I felt happy winding it up to 9 Volts.

Cheers, Brian.
Brian of Romsey is offline  
Old 14th Jul 2018, 4:44 pm   #11
Radio Wrangler
Moderator
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,798
Default Re: Pin-out for SEI Quartz Oscillator

That's good. These things were made to order and the datasheet was like a menu, choose the frequency choose the supply voltage, choose the temp range.... All the model number seemed to tie down is the package size.

David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is online now  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 10:37 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.