RE: Mattel Pulse Radio
The LM317 is cheap and really easy to work with.
Using Lipos and a regulator can sure solve a lot of problems with vintage equipment. I finally sorted out my GG system by using two LM317s to power my receiver and Rand LR-3 from one Lipo pack.
-Ron
R1.... R2.........Vout
240 1500......9.0625
240 1200......7.5
240 1000......6.458333333
240 750........5.15625
240 720........5
240 470........3.697916667
240 450........3.59375
240 440........3.541666667
240 240........2.5
240 225........2.421875
240 220........2.395833333
.1uf on Vin
10uf on Vout