The AM Forum
October 10, 2024, 12:04:03 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: BD224D equivalent?  (Read 3343 times)
0 Members and 1 Guest are viewing this topic.
wa2tak
Member

Offline Offline

Posts: 110


« on: March 24, 2023, 10:59:01 AM »

I can't seem to find a US equivalent for the BD224D transistor.

Anyone know?
Logged
wa2tak
Member

Offline Offline

Posts: 110


« Reply #1 on: March 24, 2023, 11:12:08 AM »

mistype

BD244D
Logged
KD6VXI
Contributing
Member
*
Offline Offline

Posts: 2680


Making AM GREAT Again!


« Reply #2 on: March 24, 2023, 12:03:36 PM »

ON makes it since 2016, when they bought Fairchild.

They have the datasheet.

--Shane
WP2ASS / ex KD6VXI
Logged
DMOD
AC0OB - A Place where Thermionic Emitters Rule!
Contributing
Member
*
Offline Offline

Posts: 1805


« Reply #3 on: March 25, 2023, 08:26:10 PM »

I can't seem to find a US equivalent for the BD224D transistor.

Anyone know?

listing of BD specs

https://www.futurlec.com/TransPowerSpec.shtml

Equivalent to NTE332

https://www.nteinc.com/specs/300to399/pdf/nte331.pdf

https://www.ntepartsdirect.com/ENG/CATEGORY/SEMICONDUCTORS_TRANSISTORS?gclid=Cj0KCQjwt_qgBhDFARIsABcDjOeTaqWINMsGxsYxClLlUd6H96gykIk67xw6zlaInvvXkCF81YYZF-MaAgZTEALw_wcB

https://www.electronic-spare-parts.com/descript/b/bd_244d.htm

Logged

Charlie Eppes: Dad would be so happy if we married a doctor.
Don Eppes: Yeah, well, Dad would be happy if I married someone with a pulse.NUMB3RS   Smiley
wa2tak
Member

Offline Offline

Posts: 110


« Reply #4 on: March 26, 2023, 10:13:45 AM »

Thanks a bunch.

Only source is Donberg...Ireland.

The "D" version is rated 160V...which is important.

Others that you reference only 100V.
Logged
wa2tak
Member

Offline Offline

Posts: 110


« Reply #5 on: March 26, 2023, 03:15:57 PM »

After long search...found that NTE37 will work as replacement.
Logged
Pete, WA2CWA
Moderator
Member

Offline Offline

Posts: 8132


CQ CQ CONTEST


WWW
« Reply #6 on: March 26, 2023, 03:37:15 PM »

If the the transistor is used in a complementary amplifier or switch circuit (NPN and PNP), I would suggest also getting the NTE36 transistor.
And you might be able to go and get them locally.
44 Farrand Street
Bloomfield, NJ
https://dilp.netcomponents.com/cgi-bin/nteincsup.asp?supplier=954710&Part=NTE37&updated=3/24/2023
Don't know if they have a "buy in person" at their location. Years ago they did and the location was called "Electronic Barn" at 48 Farrand St. Solid State Inc. is at 46 Farrand St.
Logged

Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
wa2tak
Member

Offline Offline

Posts: 110


« Reply #7 on: March 26, 2023, 05:13:10 PM »

The transistor is used in a circuit from the transmitter output to a vintage POWER AMP.
Seems like the T/R relay in our rigs is very current sensitive...and...the T/R relay in the amp can actually 'blow out'
the rig relay.
His circuit only puts 350uamps to the rig relay.

The TRX lab gent is a 'genius' when repairing ham gear!!
Here's his video on the relay protector:
https://www.youtube.com/watch?v=j7Aw0Y_Gan4
Logged
Pete, WA2CWA
Moderator
Member

Offline Offline

Posts: 8132


CQ CQ CONTEST


WWW
« Reply #8 on: March 26, 2023, 09:25:22 PM »

The transistor is used in a circuit from the transmitter output to a vintage POWER AMP.
Seems like the T/R relay in our rigs is very current sensitive...and...the T/R relay in the amp can actually 'blow out'
the rig relay.
His circuit only puts 350uamps to the rig relay.

The TRX lab gent is a 'genius' when repairing ham gear!!
Here's his video on the relay protector:
https://www.youtube.com/watch?v=j7Aw0Y_Gan4
Since you never gave us any history in this thread, this post sheds no information on what the problem was.
After reviewing a portion of the video, I see why you want the transistor. He should offer the video for sleep deprived people   Cheesy

Interface circuits for modern solid-state radios to interface with older power amplifiers that run high keying voltages has been around since the middle 90's if not earlier.

I use the Harbach designed interface between my solid state rigs and my Heath SB-200 amps that have a -130 volt keying voltage. The design uses an Opto-Isolator design and works extremely well. MFJ and several other manufacturers and garage builders also have designs on the market.
Here's the Harbach keying interface for the TL-922/922A:
https://harbachelectronics.com/shop/kenwood-tl-922/sk-922-soft-key-keying-interface/
W8JI has also developed an universal relay line buffer:
https://www.ctrengineeringinc.com/universal-relay-line-buffer/

The problem with the simple TRX design, if that, if the transistor breaks down for whatever reason, the high keying voltage of the amplifier will appear on the delicate relay contacts of your solid-state rig and, most likely, will fuse the contacts together.
Logged

Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
DMOD
AC0OB - A Place where Thermionic Emitters Rule!
Contributing
Member
*
Offline Offline

Posts: 1805


« Reply #9 on: March 29, 2023, 06:36:24 PM »

After long search...found that NTE37 will work as replacement.

Well, I don't know what the circuit is but my reference came the latest NTE semiconductor reference.
Logged

Charlie Eppes: Dad would be so happy if we married a doctor.
Don Eppes: Yeah, well, Dad would be happy if I married someone with a pulse.NUMB3RS   Smiley
Pete, WA2CWA
Moderator
Member

Offline Offline

Posts: 8132


CQ CQ CONTEST


WWW
« Reply #10 on: March 29, 2023, 08:54:47 PM »

After long search...found that NTE37 will work as replacement.

Well, I don't know what the circuit is but my reference came the latest NTE semiconductor reference.
I captured below the circuit from the you tube video. It's nothing more then a soft key T/R switch interface between a  solid state transceiver and an amp using 100 volts or more in their relay keying circuit.



* trx_wiz.jpg (60.21 KB, 911x483 - viewed 169 times.)
Logged

Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
DMOD
AC0OB - A Place where Thermionic Emitters Rule!
Contributing
Member
*
Offline Offline

Posts: 1805


« Reply #11 on: March 31, 2023, 09:44:32 PM »

After long search...found that NTE37 will work as replacement.

Well, I don't know what the circuit is but my reference came the latest NTE semiconductor reference.
I captured below the circuit from the you tube video. It's nothing more then a soft key T/R switch interface between a  solid state transceiver and an amp using 100 volts or more in their relay keying circuit.



OK, thanks.

I usually use a 2N6740 for those types of applications

https://pdf.datasheetcatalog.com/datasheet/mospec/2N6740.pdf


Phil
Logged

Charlie Eppes: Dad would be so happy if we married a doctor.
Don Eppes: Yeah, well, Dad would be happy if I married someone with a pulse.NUMB3RS   Smiley
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.069 seconds with 19 queries.