Warning: Creating default object from empty value in /homepages/11/d132647312/htdocs/Amfone/mkportal/include/SMF/smf_out.php on line 47
Simple, Low-cost Mic Amp and Compressor by WA7JHZ




 
The AM Forum
June 23, 2018, 01:54:20 PM *
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: Simple, Low-cost Mic Amp and Compressor by WA7JHZ  (Read 3688 times)
0 Members and 1 Guest are viewing this topic.
Steve - K4HX
Administrator
Member

Offline Offline

Posts: 2408



« on: September 06, 2015, 10:51:23 PM »

From David, WA7JHZ

Attached is a GIF schematic of my so-called compressor microphone circuit. It does AGC, peak limiting, and compression all in a simple and low-cost package. My last one is mounted in an Altoids mint can.

I also have a 600-Ohm balanced output version. My friend, Arne (W7TRO) uses one to drive his Bauer 707.

You can build one in about two hours, and I have been wiring them on a Radio Shack 276-150 prototype board (no longer carried by RS). I've built over a dozen of them with similar results.


* Altoids Comp Mic 300Hz 6-21-2015.GIF (9.36 KB, 500x400 - viewed 1094 times.)
Logged
K5IIA
Member

Offline Offline

Posts: 392



« Reply #1 on: September 07, 2015, 01:56:27 AM »

Man its late, and i may be asking something that is right there in my face, but i see the pot for modulation.  Is there any adjustment for agc and the peak limiting.. i guess the peak limiting would be the mod pot but just wanting to clear it up for me. if there is no adjustment what is the max gain that the agc will give to lower level audio below the mod level set with pot.  Hope some of this came out in English. lol
Logged

Be kind, for everyone you meet is fighting a hard battle.

73, Brandon K5iia
PA0NVD
Member

Offline Offline

Posts: 236


Nico and Chappie (Chappie is the dog...)


« Reply #2 on: March 04, 2018, 03:15:02 PM »

Hi Steve
Thanks for the schematic diagram. But I only see AGC, and depending at the speed, (the cap // to the gate), it may compress. But where is the peak limiting?
Logged
M0VRF
Member

Offline Offline

Posts: 54


« Reply #3 on: March 06, 2018, 11:50:43 AM »

The SSM2167 was invented for such use....
Logged
Steve - K4HX
Administrator
Member

Offline Offline

Posts: 2408



« Reply #4 on: March 06, 2018, 03:21:01 PM »

Not my circuit, so I can't comment. Contact WA7JHZ.
Logged
PA0NVD
Member

Offline Offline

Posts: 236


Nico and Chappie (Chappie is the dog...)


« Reply #5 on: March 06, 2018, 05:21:37 PM »

The SSM2167 was invented for such use....

Thanks for the part number, nice circuit!!
Logged
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 0.058 seconds with 19 queries.