I need to make a new transformer. I designed and made some transformers a few years back, but I've now forgotten what to do. I still have spare cores, bobbins and wire but I'm scratching my head on what I need to do. The circuit is Amplifier - transformer - piezo. The amp is the OPA548, it can supply around 50V and 5A. The piezo is 1.2uF with a resonant frequency around 25KHz. The amp and piezo work with 50V so there is nothing wrong with them it is a simple matter of me needing 100V across the piezo.
The physicality of making the transformer isn't a problem. The turns ratio needs to be 1:2. But what do I need to do? What sort of inductances do I need?
The impedance of the capacitnce of the piezo at 25KHz is about 4 ohms, I've not tried to measure the real resitivity of the piezo but usually it is around 6 ohms. So I'd say the piezo had an overall impedance of 10 ohms at the resonance it operates at.
The physicality of making the transformer isn't a problem. The turns ratio needs to be 1:2. But what do I need to do? What sort of inductances do I need?
The impedance of the capacitnce of the piezo at 25KHz is about 4 ohms, I've not tried to measure the real resitivity of the piezo but usually it is around 6 ohms. So I'd say the piezo had an overall impedance of 10 ohms at the resonance it operates at.