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Expanded Scale Voltmeter.

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Putting it all back together.

With the new scale printed and cut out, it was glued in place, again been very careful around the meter movement and pointer. I also replaced the back light bulb ( not shown ).

The finished charger with its amp meter and expanded volt meter.

Zener reference table

Some common zener part numbers and their voltage.

250mW			1W
Part No:	Voltage	Temp. Coeff of V ( %/^oC )	Part No:	Voltage	Temp. Coeff of V ( %/^oC )
1N703	3.45	-0.070	1N4728	3.3	-0.06
1N704	4.1	-0.060	1N4729	3.6	-0.06
1N705	4.85	0.030	1N4730	3.9	-0.05
1N706	5.8	0.038	1N4731	4.3	-0.03
1N707	7.1	0.050	1N4732	4.7	-0.01
1N708	5.6	0.038	1N4733	5.1	0.01
1N709	6.2	0.038	1N4734	5.6	0.03
1N710	6.8	0.038	1N4735	6.2	0.04
1N711	7.5	0.048	1N4736	6.8	0.05
1N712	8.2	0.053	1N4737	7.5	0.05
1N713	9.1	0.060	1N4738	8.2	0.05
1N714	10.0	0.061	1N4739	9.1	0.06
1N715	11	0.065	1N4740	10	0.07
1N716	12	0.068	1N4741	11	0.07
1N717	13	0.070	1N4742	12	0.07
1N718	15	0.072	1N4743	13	0.07
1N719	16	0.074	1N4744	15	0.08
1N720	18	0.077	1N4745	16	0.08
1N721	20	0.081	1N4746	18	0.08
1N722	22	0.083	1N4747	20	0.08
1N723	24	0.085	1N4748	22	0.08
1N724	27	0.088	1N4749	24	0.08
1N725	30	0.089	1N4750	27	0.09
1N726	33	0.090	1N4751	30	0.09
1N727	36	0.093	1N4752	33	0.09
1N728	39	0.094	1N4753	36	0.09
1N729	43	0.095	1N4754	39	0.09
1N730	47	0.095	1N4755	43	0.09
1N731	51	0.096	1N4756	47	0.09
1N732	56	0.096	1N4757	51	0.09
1N733	62	0.097	1N4758	56	0.09
1N734	68	0.097	1N4759	62	0.09
1N735	75	0.098	1N4760	68	0.09
1N736	82	0.098	1N4761	75	0.09
			1N4762	82	0.09

For more information about meters, take a look at this page "Meters Multipliers and Shunts".

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