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Author Topic: Leson TW-232 / Altai Microphone preamp schematic?.  (Read 5870 times)
ZS5WC
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« on: May 01, 2013, 11:11:20 PM »

 Huh

Hi All, does anyone have  a copy of the schematic of the Leson TW-232 preamp that resides in the microphone head behind the dynamic capsule?..
I want to make some circuit / frequency response alterations and require the diagram.

Many Thanks,
73!
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W9GB
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« Reply #1 on: May 08, 2013, 09:14:41 AM »

Leson was manufactured by Altai of Japan, many years ago (1980s).
Rare to find one in North America.
http://www.gumtree.com.au/s-ad/skye/audio/leson-tw-232-radio-power-desk-microphone-extinct/1008456640

The EU Freebander / CB web sites seem to have information you desire.
http://bfreebandingtalktheplanet.runboard.com/t2466

This Australian CB Radio web site, has the Manual that shipped with microphone.
http://www.ozcbradios.com/images/stories/manuals/leson/tw232_sml.pdf

Personally, I reverse engineer these unknown and poorly documented orphans.
You can then post your schematic and findings for the larger radio community.
« Last Edit: May 08, 2013, 09:23:12 AM by W9GB » Logged
W9GB
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« Reply #2 on: May 08, 2013, 07:06:52 PM »

Here is the schematic diagram for the Shure 526T desk microphone,
of that same era, that used a dynamic element microphone.
http://bama.edebris.com/download/shure/526t-preamp/Shure%20526T%20Preamp.pdf

Altai likely used a readily available Japanese transistor (2SC).
===
Last address, now in Taiwan, as of 2009.

ALTAI COMPONENTS LTD.
Email: altaitwn@ms24.hinet.net
Phone Number: 886-2-23250760
Fax Number: 886-2-27000818
Zip Code: 10683

13F-1, 26 Tun Hwa S. Rd., Sec. 2, Taipei
Taiwan, Republic Of China
http://www.altaitwn.com.tw

Primary Export Products: Turntables, Record player and turntable parts, Loudspeakers,
Other loudspeakers, Amplifier sets, Audio equipment parts, Aerials and aerial reflectors,
Microphones and stands, Other line microphones and stands, Audio equipment parts,
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« Last Edit: May 08, 2013, 07:12:48 PM by W9GB » Logged
ZS5WC
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« Reply #3 on: May 10, 2013, 07:31:19 AM »

Thanks for the info Greg,

Wiring is not the issue, I am looking for the compressor amp. schematic.
I however found a copy from a friend that has the Cobra CA-72 mic.. (Leson copy) , so I am happy.

73 de William
ZS4L
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PA1ZP
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« Reply #4 on: May 14, 2013, 11:28:11 AM »

Hi to all

I had a few of those.
They ranged in age from new to 25 yrs old.
The new one looked perfect ofcourse and the oldest one was a realy warn banger mike hihi.
1 was branded Ham International TW232
1 was branded Monacor TW232S
1 was branded Maas TW232DM
One was branded Leson TW232.

2 of those were dynamic.
But I prefered the Chrystal mikes.
The amps of the dynamic and Christal mikes are not the same though.

Normaly the only comon failure these mikes get is that the aluminium bridge on the PTT bar brakes where the Lock handle crosses the die cast aluminium PTT bar.

I think that these mikes could still be in production as I bought the TW232DM from Maas new only about 8 yrs ago.

I prefered the Christal types they were more clear and sounded better for SSB.
They do not call it Christal clear audio for nothing hihi.

Good luck with your Leson and the name TW232 brings back sweet memeries from the past.

73 Jos
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