Vintage Lafayette "Dyna Charge" battery charger. Measured 40 vdc no load output. No history could be found but upon disassembly found it to be a capacitor in series with the AC power transformer output to the diode rectifier. This low cost unique circuit lets the very low current 40 volt output useful to slowly trickle charge a variety of batteries. The lower the recharge battery voltage the faster the trickle charge time. If the user is not concerned about charge time, this is for you!
