Resistors for Mic Builders and Synths

Construction information for DIY projects, including the MS Mid Side Matrix, Elliptic Equalizer, Mastering Console, Phono Transfer System, Insert Switcher and the Dual Class-A Amplifier. You can post your baby pictures here.
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mediatechnology
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Resistors for Mic Builders and Synths

Post by mediatechnology » Mon May 26, 2008 3:37 pm

I'm stocking a couple of hard-to-find resistors that some members here may eventually need.

For the mic builder I currently have a few 2G ohm (for the search engines who visit us 2000 Mohm). I'm almost sold out of these but I have a few 1Gohm on the way with more backordered. These are Vishay RNX0382G00KNLB (2G) and RNX0501G00FNEL (1G). They are 3/8W and 1/2W sizes. (Doubt we'll see that dissipation in a microphone though.)

The other one I stock is the Precision Resistor PT-146 (PT146). This is a 3500 ppm temperature compensating 1K 1% ideal for use in log and anitlog amplifiers. The 1K PT-146-1K and the 2K PT-146-2K (2K available from Music from Outer Space) are often use in DIY synth building. The 2K is a better choice if it's in the feedback loop of an op amp.

Links are here:

http://www.ka-electronics.com/pt146/rnx-2G.htm 2G
http://www.ka-electronics.com/pt146/pt146-35.htm PT-146
http://www.musicfromouterspace.com/cata ... ge=CATALOG PT-146 2K
https://ka-electronics.com

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mediatechnology
Posts: 3733
Joined: Sat Aug 11, 2007 2:34 pm
Location: Oak Cliff, Texas
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Temperature ("tempco") Compensation Resistors for Log Amps and VCAs

Post by mediatechnology » Tue Oct 23, 2018 6:16 am

I no longer offer the Gig Ohm GΩ resistors or the PT-146 for sale but I did have to use a PT-146 1KΩ +3500 ppm I had in stock as a replacement for a failed KRL RQ-81 (Tel Labs Q81) found in a Heathkit IG-5238 AC Voltmeter with dB.

Since I did a quick web check on both KRL and Precision Resistor I thought I would post the links here:

Precision Resistor wirewound and SMT temperature compensators: http://www.precisionresistor.com/skin/r ... sators.pdf

KRL Bantry Components: http://krlbantry.com/contentmanaged.cfm?currentpage=102

After replacing the 1979 date code KRL RQ-81 with a PRC PT-146 the dB scale was only about half a needle width off. Now that's precision.

See also: http://microohm.com/temperature/tempmini401.html
https://ka-electronics.com

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