17-12-2015, 09:10 PM
Thanks very much to Hugh and "Yorkie" for providing the circuit. My meter has a made in Poland sticker and is serial number 9600.
The layout seems to correspond to the circuit version with the op-amp, HLY7006R. As I said the original op-amp has gone and a small veroboard with an empty IC socket is fitted in it's place.
A DuckDuckgo search produced a link for a Conway brochure
http://www.schematicsforfree.com/archive...uipment%20&%20Measurement/Meters/Conway%20639%20Masteranger%20Brochure.pdf
Brian
The layout seems to correspond to the circuit version with the op-amp, HLY7006R. As I said the original op-amp has gone and a small veroboard with an empty IC socket is fitted in it's place.
A DuckDuckgo search produced a link for a Conway brochure
http://www.schematicsforfree.com/archive...uipment%20&%20Measurement/Meters/Conway%20639%20Masteranger%20Brochure.pdf
Brian
