Construction Continued

Radio Record, Volume I, Issue 36, 23 March 1928, Page 11

Construction Continued

is the same as the two in the A.C, input, and can be made on a chip of ebonite 14 by Hin., and placed next to the negatve terminal behind the panet, the leads to transformer and condensers being connected to the inner end, In order to be able to place a loose piece of tin as a screen between the transformer ard valve, etc., it is a good plan to run ali the leads running in a right-hand direction down’ under the ‘hoard and up again at their respective connections. A sheet of tin is then cut to fit between the R.I. choke and condensers, running rp to the front panel and as high as the cover will allow. This should then be covered with paper on each side and dropped into piace. Its object is to isolate any hum that might emanate from the transformer. In use it may be found an improvement to connect the tin cover to earth, and for this purpose a terminal may be attached to the cover. The following are approximate prices of parts required :- .

The smatl ebonite panel to which the lighting flex is attached is 1} inch square, On this are secured under washers by fin. brass bolts, two fine strips of tinfoil to act as fuses. The inner end of each of these connects direct to a respective end of the primary winding. On the plan diagram is shown the way to wire in a lighting socket with the adapter ping so that the eliminator may be plugged into any light socket and still allow the lamp te be used. Do not haye the flex too short, as a few feet extra will do no harm and may ‘Save a lot of inconvenience. Next week will be described a dif-. ferent circnit for a similar eliminator.

£ s. d. Rectifving valve .....cecceceeeeee 015 0 1lb. 32’s s.w.g. enamelled wire 0 6 0 Hb, 36’s s.w.g. enamelled wire 0 8 0 TEOM --sesasocsseccencesceavecnee ecannes 0 2 6

4 condensers, 2 mfds, each ... 116 Royalty or Emmco variable resistance, 1500 to 100,000 OEMS ceccccceceseesereeees coseeee O10 0 Valve holder .eeicceseecreeee 010 0 Rheostat, 30 OMS wiscceseceseeee 03 0 terminals ......cccccceseeseeee vase O L O Blex, adapter .......sesssesserees 02 6 Connecting wire, 4 brass noite, | screws, ebonite, etc. ... 0 "£4 10 6 o