UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Using a two terminal 1Meg volume control pot

Jolly 7 · 20th Nov 2019, 2:11 am

I am currently in the middle of modifying an old radio that uses a small two terminal 1 Meg volume control pot. I am unable to replace it with a three terminal 5K or10K one because of severe space restrictions and the solid metal chassis it's fixed to. I want to be able to connect the pot to an LM386-based amplifier, but all of the designs I've come across use three terminal centre-tap pots. What are my amplifier circuit options using the existing two terminal pot ? I am looking to operate it with 6 to 9 volts.

20th Nov 2019, 2:11 am	#1
Jolly 7 Octode Join Date: Feb 2018 Location: Southampton, Hampshire, UK. Posts: 1,061	Using a two terminal 1Meg volume control pot I am currently in the middle of modifying an old radio that uses a small two terminal 1 Meg volume control pot. I am unable to replace it with a three terminal 5K or10K one because of severe space restrictions and the solid metal chassis it's fixed to. I want to be able to connect the pot to an LM386-based amplifier, but all of the designs I've come across use three terminal centre-tap pots. What are my amplifier circuit options using the existing two terminal pot ? I am looking to operate it with 6 to 9 volts.