# 39H BiToroid: Purely Resistive Loads, Examining Input and Output Waveforms

a member of the forum asked me to verify the input behaviour on and off load by scoping across a 1 ohm resistor, then watch the wave form and voltage measurements to observe if the input was rising with the output rising, turns out the opposite is true. the input was relaxed when the secondaries were loaded, not increased, input decreased. Once again confirming the theory and operation of the Heins BiToroid. My numbers could be a little +or-, but… The 10 ohm and 100 ohm 5 watt resistors used here got to be too hot to touch, with this small input power… whatever that insinuates 🙂 Used a few different purely resistive load values to compare their answers to rule out any inductance inside the resistors which may skew measurements also if that were the case, the input and output would see the same variance and show a good comparison anyway so here i used a 1 ohm resistor as T1000 suggested, and have it in place of my input ammeter directly off battery positive wit scope across it as i apply different loads and for loads i used a 10 ohm and a 100 ohm resistor to compare the behaviour of primary and secondary waveforms on and off load and regardless of it not being rms, the overall measurements will clearly show themselves 7.3v max peak across 10 ohms = 5.32watts 23.5v max peak across 100 ohms = 5.52watts = consistent = accurate 100 ohm loaded secondary primary reading across 1 ohm input resistor 2.89v 10 ohm loaded secondary primary reading across 1 ohm input resistor 1.5 **…**