simonsen: 31/1; Sweetheart: re-imagined

ID: 305738
simonsen: 31/1; Sweetheart: re-imagined 
16.Dec.12 19:48

Michael Watterson (IRL)
Articles: 1006
Count of Thanks: 6

I have built this in a small eddystone box using 3 x AA cell for filament, 3 x 1j24b tubes instead of 1T4 and 10 x CR2032 coin cells for HT. A modern "crystal" earpiece and miniature "polycon" capacitors from transistor AM radio. The coil is miniature AM radio Ferrite Aerial coil unit with an extra winding added.

So I redrew the schematic in "Eagle" from the original. It's all the original values and wiring but the 1j18b instead of 1T4 (DF91) pin connections.

I beleive the original 30V battery is a Hearing aid type, or possibly 2 x 15V hearing aid types. I have got a wiring error so have not yet tested my replica. The external Aerial and Earth connections use TO220 transistor isolating washers to insulate terminals from the case.


To thank the Author because you find the post helpful or well done.