If you have one of the Bob Parker designed , Dick Smith
Electronics ( Australian kit ) ESR meters and you would like to add a Low
Ohms buzzer ( as with the Capacitor Wizard ) read on .

Parts list :-

BC182 ( or similar small signal NPN type )
10k resistor
4k7 resistor
1N4148 diode ( or similar )
Piezo Transducer

The 4k7 resistor is connected to pin 11 IC3 ( the Anodes of the decimal
point LED's ) and then to the base of the BC182 , the emitter of the BC182
is connected to the Anode of the 1N4148 , the Cathode of the 1N4148
connects to the junction of Q13 Base & Q12 Collector , the Collector of the
BC182 is taken via the 10k resistor to 5v and the Piezo Transducer is
connected across the 10k resistor ( IE one connection goes to 5v and the
other to the BC182 Collector ) .

When the meter reading is below 1 Ohm the buzzer should sound , when the
reading is between 1 Ohm & 9R9 the buzzer should sound , but almost
inaudibly . 

If you want the buzzer to sound on all readings below 10 Ohms , remove the
1N4148 diode and connect the emitter of the BC182 directly to 0v .

If you don't want the buzzer to sound at all on readings above 1 Ohm ,
insert a 1k resistor between Q13 Base & Q12 Collector , connecting the
1N4148 Cathode to the Q12 Collector & 1k resistor junction . I've not
actually tried this myself but it should work - in theory anyway !

Mark Stevenson  mkstevo@nildram.co.uk
Web Site http://www.markstevenson.nildram.co.uk/index.htm 
or http://homepages.nildram.co.uk/~mkstevo/index.htm