[design square waveform oscillator circuit/ relaxation oscillator]

i want to know it is variable relaxation oscillator is the same as rectangular waveform circuit ?  ???

[design square waveform oscillator circuit/ relaxation oscillator]

thanks for the apply ... but what will i do to prefer the circuit with such that characteristic that given by my lecture ? it is actually for my latest mini project ..
do u have any idea to design that circuit ? please tell me more detail about it ........ :)

[design square waveform oscillator circuit/ relaxation oscillator]

hello all .. anyone that can help me design electronic circuit ..
this is the characteristics of the circuit :
one BJT, one OPAMP UA741 and single power supply. the oscillator will connected to a transistor with collector load of 10K the available frequency is between 200Hz to 1kHz.

i hope that any one in here can help me ...
thanks ...

[help me design electronic circuit]

hello all .. anyone that can help me design electronic circuit ..
this is the characteristics of the circuit :
one BJT, one OPAMP UA741 and single power supply. the oscillator will connected to a transistor with collector load of 10K the available frequency is between 200Hz to 1kHz.

i hope that any one in here can help me ...
thanks ...

[transformer problem]

hello guys ..
iwant to know that if transformer with 220V/15kVA  1A is same as 220V/15kVA 5A ?  ???