UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Ed_Dinning · 23rd Oct 2006, 7:46 pm

Hi Gents, that sounds like a reasonable idea, keeping the frequency low should avoid the usual harmonics getting into the signal stages and causing feed back, but for any power to be developed it will need largish components.

A simple watts calculation will show that 70V at 10mA is 0.7 W.
Without any inefficiencies this equates to 0.5 A at 1.5V.

The other approach is to go up to 2MHz plus and the parts can be very small; If the set is typical MW/LW it will not pick anything up. Half decent screening should then stop much radiation to SW sets

23rd Oct 2006, 7:46 pm	#3
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: compact HT generator idea Hi Gents, that sounds like a reasonable idea, keeping the frequency low should avoid the usual harmonics getting into the signal stages and causing feed back, but for any power to be developed it will need largish components. A simple watts calculation will show that 70V at 10mA is 0.7 W. Without any inefficiencies this equates to 0.5 A at 1.5V. The other approach is to go up to 2MHz plus and the parts can be very small; If the set is typical MW/LW it will not pick anything up. Half decent screening should then stop much radiation to SW sets