Sinclair Radionics, 1974
DM2, launched in February 1975, was far more
successful than its predecessor the DM1
(as well as being a technically superior product). It
had been designed by Sinclair's John Nicholls, who used
a mixture of chips and components which were already
in service in other Sinclair products. Only one new
chip, from General Instruments Microcircuits, was utilised.
This allowed Sinclair to take advantage of bulk buying
to lower the overall cost of the device.
The meter itself was well-designed,
doing its work to a reasonably good standard (1% accuracy)
and being easy to assemble and test. It immediately
found favour in the scientific, hobby, retailing and
educational fields, selling very well and making the
company a lot of money. For once, production problems
had been tackled from the outset and high initial demand
could be satisfied. Some 30,000 units were sold, 80%
of them overseas.