Author Topic: What's this please? (Component Advice)  (Read 1220174 times)

0 Members and 2 Guests are viewing this topic.

Offline PartialDischarge

  • Super Contributor
  • ***
  • Posts: 1611
  • Country: 00
Re: What's this please? (Component Advice)
« Reply #1100 on: January 07, 2017, 01:26:32 pm »
[Found, see below]This could be a double gate mosfet for rf Its a rf transistor (as it handles signals in the 300-400 Mhz), but probably bipolar with 2 emitter pins tied together with a characteristic printed "A" and a rounded protusion as a pin marking
Any ideas?

Actually the package thats soldered looks like the second image
« Last Edit: January 07, 2017, 02:29:01 pm by MasterTech »
 

Offline PartialDischarge

  • Super Contributor
  • ***
  • Posts: 1611
  • Country: 00
Re: What's this please? (Component Advice)
« Reply #1101 on: January 07, 2017, 02:27:47 pm »
Found it, its a Mini-Circuits MAV-11SM, MMIC amplifier in SOT86 package  :)


 

Offline salbayeng

  • Frequent Contributor
  • **
  • Posts: 296
  • Country: au
Re: What's this please? (Component Advice)
« Reply #1102 on: January 07, 2017, 10:53:32 pm »
Yep Mini-circuits makes a large variety
http://www.minicircuits.com/products/amplifiers_smt_gpw.shtml

It's usually a MAR-06 on the input and a MAV-11 on the output.
They are also made by other vendors, who keep the same trailing digits, and just change the prefix.

I have the mini-circuits 1992 printed handbook here, back then they just had MAR-1 through to MAR-8  and MAV-2, -3, -4, -11
(The MAV-x had larger transistors inside, and could dissipate more power)
The RAM-x is a ceRAMic package version of the plastic MAR-x.
Now the range has expanded.
The original MAR-x had leads that went straight out, so you needed to drill a small hole in the PCB to mount it, the SM suffix (MAR-xSM) just has kinked leads (gull wing) so it can be mounted with normal SMD assembly methods.
The VAM-x is a MAV-x in a SOT-143 package  (a bit like a SOT-23 with 4 legs) (dual gate MOS are usually packaged this way, and the BCV61 current mirror)
 

Online dexters_lab

  • Supporter
  • ****
  • Posts: 1890
  • Country: gb
Re: What's this please? (Component Advice)
« Reply #1103 on: January 18, 2017, 06:57:47 pm »
Any ideas on these two IC samples from 1981?

logo looks a bit like linear technology?

there is an exact match on the DG528 of a analog multiplexer

Just want a 2nd opinion...

Online Andy Watson

  • Super Contributor
  • ***
  • Posts: 2074
Re: What's this please? (Component Advice)
« Reply #1104 on: January 18, 2017, 07:14:57 pm »
What makes you think it's not a DG528? The logo reminds me of Siliconix. http://www.logosdatabase.com/logo/si_78623276

Edit: Aside from a Temic datasheet, look what a a search for "siliconix DG528" dragged up:
http://www.desmoines-classifieds.com/Madison-County-/Automotive-/Engine-Parts-/Linear-DG528-siliconix-vintage-ic-sample-gold-package.SHTML
« Last Edit: January 18, 2017, 07:20:42 pm by Andy Watson »
 
The following users thanked this post: dexters_lab

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 5120
  • Country: nl
Re: What's this please? (Component Advice)
« Reply #1105 on: January 18, 2017, 07:23:05 pm »
What makes you think it's not a DG528? The logo reminds me of Siliconix. http://www.logosdatabase.com/logo/si_78623276

Edit: Aside from a Temic datasheet, look what a a search for "siliconix DG528" dragged up:
http://www.desmoines-classifieds.com/Madison-County-/Automotive-/Engine-Parts-/Linear-DG528-siliconix-vintage-ic-sample-gold-package.SHTML

And here is a datasheet saying Vishay Siliconix: http://www.vishay.com/docs/70068/dg528.pdf
Keyboard error: Press F1 to continue.
 
The following users thanked this post: dexters_lab

Online dexters_lab

  • Supporter
  • ****
  • Posts: 1890
  • Country: gb
Re: What's this please? (Component Advice)
« Reply #1106 on: January 19, 2017, 04:39:33 pm »
thanks guys!

Offline Sceptre

  • Regular Contributor
  • *
  • Posts: 57
  • Country: us
Re: What's this please? (Component Advice)
« Reply #1107 on: January 21, 2017, 03:27:14 am »
Please help me identify the following LED driver IC from a head-mounted lamp:

1.  Package:  SOT23-6
2.  Top marking:  KAD4e
3.  Pinout:  1.  NC; 2.  GND; 3.  NC; 4.  LED - (through 1.3 \$\Omega\$ resistor); 5.  SWITCH; 6.  VCC (3x AAA cell)
4.  Function (per button press):  Bright, Dim, Flash, Off

I actually want to know the value of the input capacitor.  The ceramic 0805 SMD cap has a 1k \$\Omega\$ short, which drains the batteries if I leave them in.  Some driver chips that I found online take 10uF, others 0.1uF.

Thanks!
« Last Edit: January 21, 2017, 03:32:20 am by Sceptre »
 

Offline salbayeng

  • Frequent Contributor
  • **
  • Posts: 296
  • Country: au
Re: What's this please? (Component Advice)
« Reply #1108 on: January 21, 2017, 05:31:53 am »
Are there any inductors or diodes attached to the switch terminal?
 
The following users thanked this post: Sceptre

Offline SeanB

  • Super Contributor
  • ***
  • Posts: 16272
  • Country: za
Re: What's this please? (Component Advice)
« Reply #1109 on: January 21, 2017, 05:44:48 pm »
4V5 supply so not a switcher, so input capacitor can be pretty much any value from 100n to 100uF. Best is to use a 10uf ceramic in place of the existing one, or just use a 100uf 16V 85c electrolytic capacitor if there is space there to fit it in the housing. lot lower leakage, and will help with battery voltage droop on the dim setting where it is driving the led with a pulsed waveform to drop the brightness without influencing CRI.
 
The following users thanked this post: Sceptre

Offline amyk

  • Super Contributor
  • ***
  • Posts: 8240
Re: What's this please? (Component Advice)
« Reply #1110 on: January 22, 2017, 05:10:04 am »
Shouding(!?) SD3304.

Datasheet here
 
The following users thanked this post: Sceptre

Offline PartialDischarge

  • Super Contributor
  • ***
  • Posts: 1611
  • Country: 00
Re: What's this please? (Component Advice)
« Reply #1111 on: January 22, 2017, 07:33:17 am »
This is an RF mixer, but cant find anything on it. The reference 0955-0525 seems an HP part, but no luck with that list.
Can anyone recognize the logo?

 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 5120
  • Country: nl
Re: What's this please? (Component Advice)
« Reply #1112 on: January 22, 2017, 09:32:01 am »
The pinout looks the same as the standard Mini-Circuits ones like the SBL-1 and such.
Keyboard error: Press F1 to continue.
 

Offline PartialDischarge

  • Super Contributor
  • ***
  • Posts: 1611
  • Country: 00
Re: What's this please? (Component Advice)
« Reply #1113 on: January 22, 2017, 06:46:12 pm »
That was a hard one, it was manufactured by a company named Adams-Russell.Still haven't found the part but I'm close...

Found this online:

"Adams-Russell was folded into M/A-COM a long time ago. M/A-COM was bought by AMP, which was bought by Tyco. Tyco then sold the M/A-COM division to Cobham, PLC"
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 5120
  • Country: nl
Re: What's this please? (Component Advice)
« Reply #1114 on: January 22, 2017, 07:14:54 pm »
The Keysight site(!) says 'U-WAVE MIXER 460MHz MAX 0.3WATT PC PINS'
Where is it from? Sometimes the CLIP manual contains an X-ref.
Keyboard error: Press F1 to continue.
 

Offline PartialDischarge

  • Super Contributor
  • ***
  • Posts: 1611
  • Country: 00
Re: What's this please? (Component Advice)
« Reply #1115 on: January 22, 2017, 07:28:41 pm »
From a 3588A, the thing is I got the CLIP pdfs half an hour ago, and theres no manuf X reference, but based on schematics it should be equal to a SBL1 as you mentioned
 

Offline salbayeng

  • Frequent Contributor
  • **
  • Posts: 296
  • Country: au
Re: What's this please? (Component Advice)
« Reply #1116 on: January 22, 2017, 10:10:16 pm »
 The
Quote
MAX 0.3WATT
seems a bit high for a mixer, the mini-circuit mixers are typically +7dBm  (5mW) or 17dbM (50mW) on the LO , and RF usually lower. Perhaps the max 0.3watt (+25dBm) is a thermal limit??

Does your 3588A have a fried mixer on the input?
 

Offline salbayeng

  • Frequent Contributor
  • **
  • Posts: 296
  • Country: au
Re: What's this please? (Component Advice)
« Reply #1117 on: January 22, 2017, 10:49:01 pm »
OK found a manual http://www.dennlec.com/images/manuals/hp-3588a-service-manual.pdf
on page 4.11 it says the LO level is 17dBm for the input mixer , so your part won't be a SBLxxx (only 7dBm)

OK given the input range of the HP3588  it is unlikely U803 is the input mixer,
(Or maybe the mixer is being used backwards  (RF goes into the IF port) in this case you would need to be careful of the pinout, you need a part with the IF on an end pin (not a middle pin) the SRA-2 and SRA-173H-1 has this arrangement I think)
However the second mixer also operates at 17dBm, and 300MHz

So a minicircuit similar part might be SRA-1H   17dBm
(or SRA-1WH, SRA-2H, SIMA-5H, SRA-173H)

if it really is 0.3W , then maybe a VAY-1  (27dBm )





 
The following users thanked this post: PartialDischarge

Offline PartialDischarge

  • Super Contributor
  • ***
  • Posts: 1611
  • Country: 00
Re: What's this please? (Component Advice)
« Reply #1118 on: January 23, 2017, 06:25:17 am »
It belongs to the A12 first conversion unit. The module has a weird 12dB loss in a certain range of frequencies, and this range is temperature dependent!, as the module warms up things change (I actually did identify the faulty module by putting one by one in the fridge and testing the results  ;D). Since I didn't have the schematics I did replace all active components of the board (around 10) but no luck. I was directing attention to passive components now.

But just yesterday I got the schematics from artekmanuals (had I known earlier) so I should figure out the problem quick now :-/O. Attached is mixer in the schematic
« Last Edit: January 23, 2017, 06:59:11 am by MasterTech »
 
The following users thanked this post: Werecow

Offline Sceptre

  • Regular Contributor
  • *
  • Posts: 57
  • Country: us
Re: What's this please? (Component Advice)
« Reply #1119 on: January 24, 2017, 03:55:15 am »
Shouding(!?) SD3304.

Datasheet here
That's the part, alright.  I note that the datasheet schematics don't show a cap.  It's just a cheapie headlamp, I'll see how it behaves without one.

Thanks!
 

Offline cdev

  • Super Contributor
  • ***
  • !
  • Posts: 7350
  • Country: 00
Re: What's this please? (Component Advice)
« Reply #1120 on: January 24, 2017, 04:33:59 am »
Does anybody have any idea what this little board is from/for? I got it as part of an electronics grab bag. I'm dating it at around mid 80s technology?


"What the large print giveth, the small print taketh away."
 

Offline salbayeng

  • Frequent Contributor
  • **
  • Posts: 296
  • Country: au
Re: What's this please? (Component Advice)
« Reply #1121 on: January 24, 2017, 04:44:07 am »
@ sceptre ,
OK I have looked at the datasheet ,  of the two figures on the first page, the top 1 is for 3 watts (3 bars as the first mandarin character), the lower is 1 watt.
The IC is just a simple chopper,  it varies the PWM to get an average current of 1A across 3v  for the 3W led (maybe 50% duty?), and ~ 300mA for the 3W led.

Given you have 1.5ohms already, this is much larger than any internal battery resistance, so the capacitor will have only a negligible effect, the symptoms that might indicate a capacitor is needed would be erratic brightness variations, or erratic timing on the flashing mode.

 

Offline salbayeng

  • Frequent Contributor
  • **
  • Posts: 296
  • Country: au
Re: What's this please? (Component Advice)
« Reply #1122 on: January 24, 2017, 05:15:40 am »
@CDEV :
Well you have something manufactured after 1994.
Has 74HC20= 2 x Quad NAND
64HC32 = 2 x quad OR
a pair of CD4051 8:1 multiplexer
A ?? pair of transistors for inverting of signals??
a ?? pair of opamps ?? (The motorola logo is upside down??) the "610" doesn't seem part of any motorola opamp in my 1976 databook, doesn't ring any bells either.
You have at least 6 laser trimmed resistors (possibly more under the chips).
Side 2 appears to have 4 NPO capacitors (lighter yellow colors) these would be typically 10nF or less and be 1% to 5% tolerance.
And its on a ceramic base, so probably from some mid to high end unit.

Given the presence of the mutiplexors, the circuit is most likely an input attenuator for a scope or multimeter ( I have seen similar PCB's in benchtop DMM's before).
Or it could possibly be a switchable frequency filter
or less likely some kind of switchable delay generator or frequency source.

You could probably figure out which pin goes where by simply buzzing with a DMM , most likely 4 or 5 of the pins are inputs to the '20 and '32.
The 74HC parts are 5v , while the 4051 may have dual analog supplies.

Happy hunting!


 
The following users thanked this post: cdev

Offline timelessbeing

  • Frequent Contributor
  • **
  • Posts: 929
  • Country: 00
Re: What's this please? (Component Advice)
« Reply #1123 on: January 24, 2017, 07:08:39 am »
I bought a replacement probe set for my DMM.
It comes with all sorts of doo-dads which slide onto the probe tips, one of which is this blade shaped thing which I don't recognise. It didn't come with any kind of documentation or even description of parts. You can see two metal plates sandwiched together, so my guess is some kind of thermocouple. But how would I use it? Just measure the voltage? What range and what is the temp correlation?  Any thoughts?

EDIT: something just occurred to me. I wonder if you're meant to slide it down between a battery and another battery or device terminal. I'll have to try that tomorrow...
« Last Edit: January 24, 2017, 07:12:01 am by timelessbeing »
 

Offline electr_peter

  • Supporter
  • ****
  • Posts: 1300
  • Country: lt
Re: What's this please? (Component Advice)
« Reply #1124 on: January 24, 2017, 06:46:55 pm »
I bought a replacement probe set for my DMM.
It comes with all sorts of doo-dads which slide onto the probe tips, one of which is this blade shaped thing which I don't recognise. It didn't come with any kind of documentation or even description of parts. You can see two metal plates sandwiched together, so my guess is some kind of thermocouple. But how would I use it? Just measure the voltage? What range and what is the temp correlation?  Any thoughts?

EDIT: something just occurred to me. I wonder if you're meant to slide it down between a battery and another battery or device terminal. I'll have to try that tomorrow...
It certainly looks like a current measurement adapter for measuring dry cells relatively easily. Metal plates should be insulated from each other. With such scheme current measurement is very easy from wiring point of view.

Similar DIY adapters were discussed on this forum https://www.eevblog.com/forum/projects/dry-cell-battery-monitor-adaptor-ultra-thin-pcb/msg541684/#msg541684
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf