Kapanadze Cousin - DALLY FREE ENERGY

[Jeg]

Thank you Sergy
I usally use the 2sc5200 audio amplifier like the most in here. See specs for comparison.
2.50 € per piece in my country.

KT805

Polarity          NPN
Рc max, W     30
Ucb max, V    300
Uce max, V    135
Ueb max, V    5
Ic max, А       5
h21е              >15
Uce sat, V      1
Ft, МHz          20
Package         TO-220AB

2SC5200

[AlienGrey]

The KT805A is a higher power version.
ALL the same, it's a crap circuit if your paying that kind of money and it won't last very long as the circuit is very basic with no protection.
but this circuit is just really 'crap' draw any real power from it and you will get smoke because that HV will
be reflected into the base of your transistor and another one bites the dust as in Queen song!.

[Jeg]

The KT805A is a higher power version.
ALL the same, it's a crap circuit if your paying that kind of money and it won't last very long as the circuit is very basic with no protection.
but this circuit is just really 'crap' draw any real power from it and you will get smoke because that HV will
be reflected into the base of your transistor and another one bites the dust as in Queen song!.

Where is your zener protection???

[AlienGrey]

Where is your zener protection???

Zener ?  that won't fix it for our use, you need the frequency fixed between strict limits
1.5mhz for a 40-meter band and 2mhz for a 37.5m band it need feeding into a buffer and then a driver
with fast on and fast off time MOSFETs have a lot of capacitance that needs disputing real fast in this circuit
and then it will need tuning like a 160meter band transmitter tank to minimize loss and on the output
I would use a fast diode and a VDR, not a zener.
But then you're building it not me.

[Jeg]

Zener ?  that won't fix it for our use, you need the frequency fixed between strict limits
1.5mhz for a 40-meter band and 2mhz for a 37.5m band it need feeding into a buffer and then a driver
with fast on and fast off time MOSFETs have a lot of capacitance that needs disputing real fast in this circuit
and then it will need tuning like a 160meter band transmitter tank to minimize loss and on the output
I would use a fast diode and a VDR, not a zener.
But then you're building it not me.

Yes Transient Voltage suppresors are supperior to zeners in speed! I just can't find any in this small voltage range i need. Do you have in mind any specific model or type?