Building the Mini Theremin is straightforward, with virtually all parts (except for the loudspeaker and switches S1 & S2) are mounted on a PC board coded 01207061 (188 x 103mm). This is housed in a plastic UB2 utility case measuring 197 x 113 x 63mm.

Fig.5 shows the assembly details. Begin by carefully checking the PC board for any defects (eg, shorts between tracks or broken tracks). Check also that all the hole sizes are correct for the various parts. In particular, check the hole sizes for the 6.35mm jack sockets, the DC power socket, the IF coils and the potentiometer mounting holes and redrill the holes to a larger size if necessary.

Note also that the corners of the PC board need to have cutouts as shown in Fig.5, to clear the four corner pillars in the case. If necessary, these can be cut using a small hacksaw and carefully filed to shape using a rat-tail file.

Table 1: Resistor Colour Codes No. Value 4-Band Code (1%) 5-Band Code (1%) 1 330kω orange orange yellow brown orange orange black orange brown 10 100kω brown black yellow brown brown black black orange brown 1 47kω yellow violet orange brown yellow violet black red brown 2 22kω red red orange brown red red black red brown 4 10kω brown black orange brown brown black black red brown 1 4.7kω yellow violet red brown yellow violet black brown brown 4 2.2kω red red red brown red red black brown brown 6 1kω brown black red brown brown black black brown brown 2 680ω blue grey brown brown blue grey black black brown 1 330ω orange orange brown brown orange orange black black brown 2 220ω red red brown brown red red black black brown 1 150ω brown green brown brown brown green black black brown 3 100ω brown black brown brown brown black black black brown 1 39ω orange white black brown orange white black gold brown 3 10ω brown black black brown brown black black gold brown