OK, I see the pop rivet now. Thanks.
The BD139/140 I use are electrically insulated so I didn't have to use sil-pads.
Search found 5463 matches
- Sun Nov 09, 2008 9:32 am
- Forum: Pro Audio Design
- Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
- Replies: 80
- Views: 353254
- Sun Nov 09, 2008 8:41 am
- Forum: Pro Audio Design
- Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
- Replies: 80
- Views: 353254
Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
Hey Radiance you're welcome!
Thanks for the data.
One thing I can't tell from the photos is whether or not the Vbe multiplier transistors are firmly attached to the heatsinks. Is it clamped somehow? Since it's on the backside I couldn't tell.
Thanks for the data.
One thing I can't tell from the photos is whether or not the Vbe multiplier transistors are firmly attached to the heatsinks. Is it clamped somehow? Since it's on the backside I couldn't tell.
- Sat Nov 08, 2008 2:39 pm
- Forum: Pro Audio Design
- Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
- Replies: 80
- Views: 353254
Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
That's really cool to see. Nice pics! The way I set the 1K output bias current was to measure the emitter current of either the top or bottom transistor via the I*R drop across Re. Depending on the size of your heatsink you can set the class-A current from maybe 65 mA to 85 mA IIRC. WIth 3R3 emitter...
- Fri Oct 24, 2008 11:56 am
- Forum: Document
- Topic: Solitron BHA-0002 BHA-0004 Datasheets
- Replies: 1
- Views: 6841
Solitron BHA-0002 BHA-0004 Datasheets
When I find old vintage semiconductors in my inventory I try to Google the part number to find the datasheet. I couldn't find these on-line anywhere but did learn that the BHA-0004 was used quite often in the geophysical industry. A patent also references the part and it's even been cloned. http://w...
- Wed Oct 22, 2008 7:24 pm
- Forum: Pro Audio Design
- Topic: THAT1510 THAT1512 Single-Supply Preamp with "T-Bias"
- Replies: 7
- Views: 30873
Re: THAT1510 THAT1512 Single-Supply Preamp with "T-Bias"
I was just looking at the SSL 82E149 active mic preamp and noticed that it used T-bias: https://www.ka-electronics.com/images/jpg/SSL_82E149_T-Bias.jpg The full pdf is here: https://www.ka-electronics.com/images/SSL/ssl_drawings_index.htm I notice that the bias resistors form a ~3K differential load...
- Fri Oct 17, 2008 7:03 am
- Forum: Document
- Topic: MicMix MasterRoom XL-305 Schematics and Manual
- Replies: 2
- Views: 27891
MicMix MasterRoom XL-305 Schematics and Manual
Here are the XL-305 schematics. These files range in size from ~2.5 MB to 4 MB. https://www.ka-electronics.com/MasterRoom/XL305_Tile1.JPG https://www.ka-electronics.com/MasterRoom/XL305_Tile2.JPG https://www.ka-electronics.com/MasterRoom/XL305_Tile3.JPG https://www.ka-electronics.com/MasterRoom/XL30...
- Wed Oct 15, 2008 3:30 pm
- Forum: The Peabody Lounge
- Topic: Hello Forum
- Replies: 2
- Views: 7320
Re: Hello Forum
Thanks for joining us and welcome aboard!
Wayne
Wayne
- Fri Oct 10, 2008 5:24 pm
- Forum: Document
- Topic: Symetrix 425 Manual
- Replies: 0
- Views: 8315
Symetrix 425 Manual
I had a Symetrix 425 expander/compressor/limiter in for repair and decided to scan the manual and host the pdf. https://www.ka-electronics.com/Images/pdf/Symetrix_425_Manual.pdf (25 MB) It uses a CA3046 transistor array as a detector with both log peak and log average outputs. It's very similar to t...
- Thu Oct 09, 2008 4:05 pm
- Forum: Pro Audio Design
- Topic: new shiny hammer- or Universal comp
- Replies: 52
- Views: 88911
Re: new shiny hammer- or Universal comp
Congratulations JR!
How do we get some?
How do we get some?
- Mon Oct 06, 2008 8:16 pm
- Forum: Pro Audio Design
- Topic: THAT1510 THAT1512 Single-Supply Preamp with "T-Bias"
- Replies: 7
- Views: 30873
Re: THAT1510 THAT1512 Single-Supply Preamp with "T-Bias"
Thanks John - I do agree that 1Kx2 might be a little low as a differential load. 1.5Kx2 or 2Kx2 raises Zdiff to a more acceptable level. There is one source I need to cite that places the desired Zdiff around 3K total. I think the 3K assupmtion is based on paralleled active inputs for splits... I do...